Find the next smallest palindrome of N

Write a python program to find the next smallest palindrome of a specified number.

import sys

def next_smallest_palindrome(N):
    for i in range(N + 1, sys.maxsize):
        if str(i) == str(i)[::-1]:
            return i

# test
print(next_smallest_palindrome(99))      # 101
print(next_smallest_palindrome(1221))    # 1331

See also

https://www.w3resource.com/python-exercises/math/python-math-exercise-22.php