21056079924 has 60 divisors (see below), whose sum is σ = 60048830688. Its totient is φ = 6380629200.

The previous prime is 21056079899. The next prime is 21056079943. The reversal of 21056079924 is 42997065012.

21056079924 is a `hidden beast` number, since 2 + 10 + 5 + 607 + 9 + 9 + 24 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 21056079924.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2950432 + ... + 2957559.

Almost surely, 2^21056079924 is an apocalyptic number.

It is an amenable number.

21056079924 is an abundant number, since it is smaller than the sum of its proper divisors (38992750764).

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

21056079924 is a wasteful number, since it uses less digits than its factorization.

21056079924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5908018 (or 5908007 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The spelling of 21056079924 in words is "twenty-one billion, fifty-six million, seventy-nine thousand, nine hundred twenty-four".