21573015008 has 48 divisors (see below), whose sum is σ = 42988397760. Its totient is φ = 10655808000.

The previous prime is 21573014971. The next prime is 21573015043. The reversal of 21573015008 is 80051037512.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1482713 + ... + 1497191.

It is an arithmetic number, because the mean of its divisors is an integer number (895591620).

Almost surely, 2^21573015008 is an apocalyptic number.

It is an amenable number.

21573015008 is a deficient number, since it is larger than the sum of its proper divisors (21415382752).

21573015008 is a wasteful number, since it uses less digits than its factorization.

21573015008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15051 (or 15043 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 32.

The spelling of 21573015008 in words is "twenty-one billion, five hundred seventy-three million, fifteen thousand, eight".