11133111231 has 16 divisors (see below), whose sum is σ = 17992907520. Its totient is φ = 6747339960.

The previous prime is 11133111217. The next prime is 11133111233. The reversal of 11133111231 is 13211133111.

It is not a de Polignac number, because 11133111231 - 2¹⁸ = 11132849087 is a prime.

It is a super-2 number, since 2×11133111231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11133111233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18742315 + ... + 18742908.

It is an arithmetic number, because the mean of its divisors is an integer number (1124556720).

Almost surely, 2^11133111231 is an apocalyptic number.

11133111231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11133111231 is a deficient number, since it is larger than the sum of its proper divisors (6859796289).

11133111231 is a wasteful number, since it uses less digits than its factorization.

11133111231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37485243 (or 37485237 counting only the distinct ones).

The product of its digits is 54, while the sum is 18.

Adding to 11133111231 its reverse (13211133111), we get a palindrome (24344244342).

The spelling of 11133111231 in words is "eleven billion, one hundred thirty-three million, one hundred eleven thousand, two hundred thirty-one".