12521113524 has 18 divisors (see below), whose sum is σ = 31650592610. Its totient is φ = 4173704496.

The previous prime is 12521113523. The next prime is 12521113529. The reversal of 12521113524 is 42531112521.

It is a happy number.

12521113524 is a `hidden beast` number, since 1 + 2 + 5 + 21 + 113 + 524 = 666.

It can be written as a sum of positive squares in only one way, i.e., 7755972624 + 4765140900 = 88068^2 + 69030^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12521113523) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 173904319 + ... + 173904390.

Almost surely, 2^12521113524 is an apocalyptic number.

It is an amenable number.

12521113524 is an abundant number, since it is smaller than the sum of its proper divisors (19129479086).

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

12521113524 is a wasteful number, since it uses less digits than its factorization.

12521113524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347808719 (or 347808714 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The spelling of 12521113524 in words is "twelve billion, five hundred twenty-one million, one hundred thirteen thousand, five hundred twenty-four".