12131012520 has 128 divisors (see below), whose sum is σ = 44112816000. Its totient is φ = 2940848640.

The previous prime is 12131012471. The next prime is 12131012557. The reversal of 12131012520 is 2521013121.

12131012520 is a `hidden beast` number, since 1 + 2 + 131 + 0 + 12 + 520 = 666.

It is a super-2 number, since 2×12131012520² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 12131012493 and 12131012502.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 498685 + ... + 522444.

It is an arithmetic number, because the mean of its divisors is an integer number (344631375).

Almost surely, 2^12131012520 is an apocalyptic number.

12131012520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12131012520 is an abundant number, since it is smaller than the sum of its proper divisors (31981803480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12131012520 is a wasteful number, since it uses less digits than its factorization.

12131012520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1021160 (or 1021150 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

Adding to 12131012520 its reverse (2521013121), we get a palindrome (14652025641).

The spelling of 12131012520 in words is "twelve billion, one hundred thirty-one million, twelve thousand, five hundred twenty".