12311122131 has 72 divisors (see below), whose sum is σ = 22622512640. Its totient is φ = 6314124960.

The previous prime is 12311122129. The next prime is 12311122139. The reversal of 12311122131 is 13122111321.

It is not a de Polignac number, because 12311122131 - 2¹ = 12311122129 is a prime.

It is a super-2 number, since 2×12311122131² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12311122139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 591996 + ... + 612438.

Almost surely, 2^12311122131 is an apocalyptic number.

12311122131 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12311122131 is a deficient number, since it is larger than the sum of its proper divisors (10311390509).

12311122131 is a wasteful number, since it uses less digits than its factorization.

12311122131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20557 (or 20543 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

Adding to 12311122131 its reverse (13122111321), we get a palindrome (25433233452).

The spelling of 12311122131 in words is "twelve billion, three hundred eleven million, one hundred twenty-two thousand, one hundred thirty-one".