21537192804 has 96 divisors (see below), whose sum is σ = 52128168960. Its totient is φ = 6915497472.

The previous prime is 21537192779. The next prime is 21537192811. The reversal of 21537192804 is 40829173512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35481069 + ... + 35481675.

It is an arithmetic number, because the mean of its divisors is an integer number (543001760).

Almost surely, 2^21537192804 is an apocalyptic number.

It is an amenable number.

21537192804 is an abundant number, since it is smaller than the sum of its proper divisors (30590976156).

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

21537192804 is a wasteful number, since it uses less digits than its factorization.

21537192804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1317 (or 1315 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 42.

The spelling of 21537192804 in words is "twenty-one billion, five hundred thirty-seven million, one hundred ninety-two thousand, eight hundred four".