21607902568 has 64 divisors (see below), whose sum is σ = 46504604160. Its totient is φ = 9220248576.

The previous prime is 21607902557. The next prime is 21607902593. The reversal of 21607902568 is 86520970612.

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 15 ways as a sum of consecutive naturals, for example, 22116096 + ... + 22117072.

It is an arithmetic number, because the mean of its divisors is an integer number (726634440).

Almost surely, 2^21607902568 is an apocalyptic number.

21607902568 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21607902568 is an abundant number, since it is smaller than the sum of its proper divisors (24896701592).

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

21607902568 is a wasteful number, since it uses less digits than its factorization.

21607902568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2306 (or 2302 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 46.

The spelling of 21607902568 in words is "twenty-one billion, six hundred seven million, nine hundred two thousand, five hundred sixty-eight".