El número de pedido aparece en la pantalla.

Because número is a singular masculine noun, so it normally takes the masculine singular article el when you are talking about a specific one: el número.

In this sentence, el número de pedido means the order number, so Spanish uses the definite article just like English does.

Also, número has a written accent because the stress falls on the first syllable: NÚ-me-ro.

Número de pedido is the usual way to say order number as a label or type of number.

Here, de works a bit like of in English, but in Spanish this structure is very common for compound nouns:

• número de teléfono = phone number
• tarjeta de crédito = credit card
• centro de salud = health centre

If you said número del pedido, it would usually mean the number of the order, referring to a particular order already identified in the conversation. That is possible in some contexts, but número de pedido is the standard phrase you often see on websites, receipts, and forms.

Here, pedido means order, especially a purchase order or something you have ordered from a shop or website.

So número de pedido is the reference number for that order.

In Spain, pedido is very common in shopping, delivery, and customer service contexts.

Aparece comes from aparecer, which usually means to appear.

In this sentence, it can mean something like:

• appears
• shows up
• is displayed

In interface or instruction language, Spanish often uses aparecer naturally where English might prefer is shown or is displayed.

So El número de pedido aparece en la pantalla is a very natural way to say that the order number becomes visible on the screen.

Because está and aparece do slightly different jobs.

• está en la pantalla = it is on the screen / it is located on the screen
• aparece en la pantalla = it appears on the screen / it shows up on the screen

So aparece focuses on the fact that it becomes visible or is shown, while está focuses more on location or state.

In many real situations both could make sense, but aparece is better if the idea is that the number is shown to the user.

Spanish normally uses en for things shown on a screen.

So:

• en la pantalla = on the screen

Even though English uses on, Spanish prefers en here. This is very common with screens, pages, photos, and other surfaces or spaces where information appears.

• a la pantalla would suggest movement toward the screen, so it would not fit here.
• sobre la pantalla usually means physically on top of the screen, which is not the intended meaning.

Yes. Spanish word order is more flexible than English.

The original sentence:

• El número de pedido aparece en la pantalla.

is neutral and very natural.

You could also say:

• En la pantalla aparece el número de pedido.

This version puts more emphasis on where it appears.

Both are correct, but the original is probably the most straightforward for a general statement.

Because pantalla is a feminine noun in Spanish, so it takes la:

• la pantalla

There is no deep logical reason you need to learn here — noun gender is just part of the word. A good habit is to learn nouns together with their article:

• la pantalla
• el número
• el pedido

Yes. Pantalla is the normal everyday word for screen in Spanish.

It can refer to:

• a computer screen
• a phone screen
• a TV screen
• a display in general

So in this sentence, la pantalla is exactly the word you would expect.

A simple pronunciation guide is:

el NOO-me-ro de pe-DEE-do a-pa-RE-the en la pan-TA-lya
in most of Spain

A few useful notes for Spain Spanish:

• número is stressed on the first syllable.
• pedido is stressed on -di-: pe-DI-do.
• aparece is stressed on -re-: a-pa-RE-ce.
• In most of Spain, the c in aparece before e sounds like the th in think.

So in Spain you often hear something close to:

a-pa-RE-the

Yes. That is a very good translation.

Even though aparece literally means appears, in this kind of context English often uses:

• is displayed
• appears
• shows up

So if the meaning has already been given to the learner, it is useful to know that Spanish may choose a more direct appears verb where English might choose a more passive expression.