Write down, if possible, the largest natural number. (Exist/Does not exist)

Are all natural numbers also whole numbers?

Are all whole numbers also natural numbers? (Yes/No)

Give successor of the following whole number:

$1000909$

Give successor of the whole number:

$2340900$

Give successor of the following whole number:

$7039999$

Write down the predecessor of the following whole number:

$10000$

Write down the predecessor of the following whole number: