521621421715325 has 12 divisors (see below), whose sum is σ = 647198571714720. Its totient is φ = 417046809122160.

The previous prime is 521621421715313. The next prime is 521621421715391. The reversal of 521621421715325 is 523517124126125.

It is not a de Polignac number, because 521621421715325 - 2¹⁴ = 521621421698941 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 521621421715325.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6258163745 + ... + 6258247094.

It is an arithmetic number, because the mean of its divisors is an integer number (53933214309560).

Almost surely, 2^{521621421715325} is an apocalyptic number.

It is an amenable number.

521621421715325 is a deficient number, since it is larger than the sum of its proper divisors (125577149999395).

521621421715325 is a wasteful number, since it uses less digits than its factorization.

521621421715325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12516412516 (or 12516412511 counting only the distinct ones).

The product of its digits is 1008000, while the sum is 47.

The spelling of 521621421715325 in words is "five hundred twenty-one trillion, six hundred twenty-one billion, four hundred twenty-one million, seven hundred fifteen thousand, three hundred twenty-five".