11123133231 has 24 divisors (see below), whose sum is σ = 17653430784. Its totient is φ = 6208256880.

The previous prime is 11123133227. The next prime is 11123133239. The reversal of 11123133231 is 13233132111.

It is a happy number.

It is not a de Polignac number, because 11123133231 - 2² = 11123133227 is a prime.

It is a super-2 number, since 2×11123133231² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 11123133198 and 11123133207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11123133239) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 873535 + ... + 886176.

It is an arithmetic number, because the mean of its divisors is an integer number (735559616).

Almost surely, 2^11123133231 is an apocalyptic number.

11123133231 is a deficient number, since it is larger than the sum of its proper divisors (6530297553).

11123133231 is a wasteful number, since it uses less digits than its factorization.

11123133231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1759771 (or 1759764 counting only the distinct ones).

The product of its digits is 324, while the sum is 21.

Adding to 11123133231 its reverse (13233132111), we get a palindrome (24356265342).

The spelling of 11123133231 in words is "eleven billion, one hundred twenty-three million, one hundred thirty-three thousand, two hundred thirty-one".