21602992920 has 64 divisors (see below), whose sum is σ = 66031809120. Its totient is φ = 5652102144.

The previous prime is 21602992877. The next prime is 21602992921. The reversal of 21602992920 is 2929920612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21602992921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1691989 + ... + 1704708.

Almost surely, 2^21602992920 is an apocalyptic number.

21602992920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21602992920 is an abundant number, since it is smaller than the sum of its proper divisors (44428816200).

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

21602992920 is a wasteful number, since it uses less digits than its factorization.

21602992920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3396764 (or 3396760 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 42.

The spelling of 21602992920 in words is "twenty-one billion, six hundred two million, nine hundred ninety-two thousand, nine hundred twenty".