21601622056 has 32 divisors (see below), whose sum is σ = 46301472000. Its totient is φ = 9255381696.

The previous prime is 21601622041. The next prime is 21601622069. The reversal of 21601622056 is 65022610612.

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, 170250 + ... + 268678.

It is an arithmetic number, because the mean of its divisors is an integer number (1446921000).

Almost surely, 2^21601622056 is an apocalyptic number.

It is an amenable number.

21601622056 is an abundant number, since it is smaller than the sum of its proper divisors (24699849944).

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

21601622056 is a wasteful number, since it uses less digits than its factorization.

21601622056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102361 (or 102357 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The spelling of 21601622056 in words is "twenty-one billion, six hundred one million, six hundred twenty-two thousand, fifty-six".