21700910656 has 56 divisors (see below), whose sum is σ = 45984810240. Its totient is φ = 10138329600.

The previous prime is 21700910653. The next prime is 21700910657. The reversal of 21700910656 is 65601900712.

It is not an unprimeable number, because it can be changed into a prime (21700910653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131050 + ... + 246121.

Almost surely, 2^21700910656 is an apocalyptic number.

It is an amenable number.

21700910656 is an abundant number, since it is smaller than the sum of its proper divisors (24283899584).

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

21700910656 is a wasteful number, since it uses less digits than its factorization.

21700910656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377243 (or 377233 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 37.

The spelling of 21700910656 in words is "twenty-one billion, seven hundred million, nine hundred ten thousand, six hundred fifty-six".