21606364216 has 64 divisors (see below), whose sum is σ = 43875014400. Its totient is φ = 9943388928.

The previous prime is 21606364187. The next prime is 21606364259. The reversal of 21606364216 is 61246360612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 728901 + ... + 757963.

It is an arithmetic number, because the mean of its divisors is an integer number (685547100).

Almost surely, 2^21606364216 is an apocalyptic number.

It is an amenable number.

21606364216 is an abundant number, since it is smaller than the sum of its proper divisors (22268650184).

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

21606364216 is a wasteful number, since it uses less digits than its factorization.

21606364216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29228 (or 29224 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 37.

The spelling of 21606364216 in words is "twenty-one billion, six hundred six million, three hundred sixty-four thousand, two hundred sixteen".