12121513521531 has 16 divisors (see below), whose sum is σ = 16329214199424. Its totient is φ = 7997416821504.

The previous prime is 12121513521503. The next prime is 12121513521563. The reversal of 12121513521531 is 13512531512121.

It is not a de Polignac number, because 12121513521531 - 2²² = 12121509327227 is a prime.

It is a super-2 number, since 2×12121513521531² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12121513521492 and 12121513521501.

It is not an unprimeable number, because it can be changed into a prime (12121513521581) 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, 7671220 + ... + 9115406.

It is an arithmetic number, because the mean of its divisors is an integer number (1020575887464).

Almost surely, 2^{12121513521531} is an apocalyptic number.

12121513521531 is a deficient number, since it is larger than the sum of its proper divisors (4207700677893).

12121513521531 is a wasteful number, since it uses less digits than its factorization.

12121513521531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1473130.

The product of its digits is 9000, while the sum is 33.

The spelling of 12121513521531 in words is "twelve trillion, one hundred twenty-one billion, five hundred thirteen million, five hundred twenty-one thousand, five hundred thirty-one".