If you add a number and it's reverse, it'll will always finish as a palindrome... except 196

palindrome.js

// Don't try 196
// https://www.youtube.com/watch?v=7RSqBuZzthk

let number = 296;
let isPalindrome = false;

reverseNum = (number) => Number(number.toString().split('').reverse().join(''));

while (!isPalindrome) {
    number += reverseNum(number);
    isPalindrome = (number === reverseNum(number));
}

console.log(number); // i.e. 296 + 692 = 988 + 889 = 1877 ... = 881188