Given an integer, determine whether it reads the same backward as forward without converting to string.
Example 1:
Input: x = 121
Output: true
Example 2:
Input: x = -121
Output: false
Explanation: Reads as 121- from right to left — not a palindrome.
Example 3:
Input: x = 10
Output: false
Explanation: Reads as 01 from right to left — not a palindrome.