21662609992 has 48 divisors (see below), whose sum is σ = 45418194000. Its totient is φ = 9657614592.

The previous prime is 21662609971. The next prime is 21662610029. The reversal of 21662609992 is 29990626612.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 202642 + ... + 290497.

It is an arithmetic number, because the mean of its divisors is an integer number (946212375).

Almost surely, 2^21662609992 is an apocalyptic number.

It is an amenable number.

21662609992 is an abundant number, since it is smaller than the sum of its proper divisors (23755584008).

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

21662609992 is a wasteful number, since it uses less digits than its factorization.

21662609992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493198 (or 493177 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 52.

The spelling of 21662609992 in words is "twenty-one billion, six hundred sixty-two million, six hundred nine thousand, nine hundred ninety-two".