21656614360 has 32 divisors (see below), whose sum is σ = 48741462000. Its totient is φ = 8660142720.

The previous prime is 21656614351. The next prime is 21656614379. The reversal of 21656614360 is 6341665612.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65191 + ... + 218089.

Almost surely, 2^21656614360 is an apocalyptic number.

21656614360 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21656614360 is an abundant number, since it is smaller than the sum of its proper divisors (27084847640).

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

21656614360 is a wasteful number, since it uses less digits than its factorization.

21656614360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156451 (or 156447 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 40.

The spelling of 21656614360 in words is "twenty-one billion, six hundred fifty-six million, six hundred fourteen thousand, three hundred sixty".