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There are more 12-digit palindromic numbers than 11-digit palindromic numbers. This is because the number of possible 12-digit palindromic numbers is greater than the number of possible 11-digit palindromic numbers. In general, the number of palindromic numbers of length n is 9 * 10^((n-1)/2), so for 11-digit palindromic numbers, there are 9 * 10^5 = 900,000 possibilities, while for 12-digit palindromic numbers, there are 9 * 10^6 = 9,000,000 possibilities.
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ViviThere are the same number: any twelve digit palindrome is just an eleven digit palindrome with its central digit repeated. In general, if we are considering numbers of n digits: For even values of n, the number of palindromes is 9 x 10n/2 - 1 For odd values of n, the number of palindromes is 9 x 10(n-1)/2
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Which 2 digit numbers have palindromic squares?
11
Which 2-digit numbers have palindromic squares?
11
Is a 10 digit palindromic number bigger than a 11 digit palindromic number?
No.
Are there more 10-digit or 11-digit palindromic numbers?
-1
What is the sum of the digits of the largest 4-digit palindromic number which is divisible by 15?
-11
