Can't we iterate over integer using map in python?

Here, in line ans = list(map(int, num)) it’s returning int object is not iterable. Can’t we just change int number to list using map?

def plusOne(self, digits: List[int]) -> List[int]:
        # arr = [str(x) for x in digits]
        arr = list(map(str, digits))
        word = ''
        word = word.join(arr)
        num = int(word)
        num1 = num + 1
        ans = list(map(int, num))
        return ans

>Solution :

No map changes each element of a iterable. Integers are not iterable.

This can be achieved like this:

list(str(124))