A word or number that remains the same when you read it from start or end is called a palindrome. Like 121 or 12321. Did you know, when you multiply numbers containing only 1s with themselves, the result is always a palindrome? For example, 111 * 111=12321 (three 1s), Four 1s (1111 * 1111=1234321). What is 111111111 * 111111111?