is it a palindrome integer

is_palindrome_integer.py

import math

class Solution:

    def isPalindrome(self, x):
        '''
        :type x: int
        :rtype: bool
        '''
        if x < 0:
            return False
        if x == 0:
            return True
        num_ln = math.ceil(math.log10(x))
        ten_pow_den = pow(10, num_ln-1)
        return self.helper(ten_pow_den, num_ln, x)

    
    def helper(self, ten_pow_den, num_ln, x):
        # print(f"num_ln={num_ln} ten_pow_den={ten_pow_den} x={x}")
        if num_ln <= 0: return True
        lhs_num, rhs_num = x//ten_pow_den, x%10
        # print(lhs_num, rhs_num)
        if lhs_num != rhs_num:
            return False
        num_ln -= 2
        new_x = (x%ten_pow_den)//10
        ten_pow_den = pow(10, num_ln-1)
        return self.helper(ten_pow_den, num_ln, new_x)