12521205536 has 48 divisors (see below), whose sum is σ = 29081525760. Its totient is φ = 5193123840.

The previous prime is 12521205509. The next prime is 12521205539. The reversal of 12521205536 is 63550212521.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (12521205539) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 894641 + ... + 908528.

It is an arithmetic number, because the mean of its divisors is an integer number (605865120).

Almost surely, 2^12521205536 is an apocalyptic number.

12521205536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12521205536 is an abundant number, since it is smaller than the sum of its proper divisors (16560320224).

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

12521205536 is a wasteful number, since it uses less digits than its factorization.

12521205536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1803217 (or 1803209 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 32.

The spelling of 12521205536 in words is "twelve billion, five hundred twenty-one million, two hundred five thousand, five hundred thirty-six".