21568920504 has 32 divisors (see below), whose sum is σ = 53966250000. Its totient is φ = 7183780352.

The previous prime is 21568920487. The next prime is 21568920509. The reversal of 21568920504 is 40502986512.

It is a super-2 number, since 2×21568920504² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21568920509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 336129 + ... + 395120.

Almost surely, 2^21568920504 is an apocalyptic number.

21568920504 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21568920504 is an abundant number, since it is smaller than the sum of its proper divisors (32397329496).

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

21568920504 is a wasteful number, since it uses less digits than its factorization.

21568920504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 732487 (or 732483 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 42.

The spelling of 21568920504 in words is "twenty-one billion, five hundred sixty-eight million, nine hundred twenty thousand, five hundred four".