21872090804 has 24 divisors (see below), whose sum is σ = 38446210656. Its totient is φ = 10887500000.

The previous prime is 21872090791. The next prime is 21872090813. The reversal of 21872090804 is 40809027812.

It is a super-2 number, since 2×21872090804² (a number of 21 digits) contains 22 as substring.

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, 3260654 + ... + 3267354.

It is an arithmetic number, because the mean of its divisors is an integer number (1601925444).

Almost surely, 2^21872090804 is an apocalyptic number.

It is an amenable number.

21872090804 is a deficient number, since it is larger than the sum of its proper divisors (16574119852).

21872090804 is a wasteful number, since it uses less digits than its factorization.

21872090804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10207 (or 10205 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 41.

The spelling of 21872090804 in words is "twenty-one billion, eight hundred seventy-two million, ninety thousand, eight hundred four".