21315525324 has 12 divisors (see below), whose sum is σ = 49736225784. Its totient is φ = 7105175104.

The previous prime is 21315525311. The next prime is 21315525331. The reversal of 21315525324 is 42352551312.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 888146877 + ... + 888146900.

It is an arithmetic number, because the mean of its divisors is an integer number (4144685482).

Almost surely, 2^21315525324 is an apocalyptic number.

It is an amenable number.

21315525324 is an abundant number, since it is smaller than the sum of its proper divisors (28420700460).

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

21315525324 is a wasteful number, since it uses less digits than its factorization.

21315525324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1776293784 (or 1776293782 counting only the distinct ones).

The product of its digits is 36000, while the sum is 33.

The spelling of 21315525324 in words is "twenty-one billion, three hundred fifteen million, five hundred twenty-five thousand, three hundred twenty-four".