21716714644 has 24 divisors (see below), whose sum is σ = 38121083168. Its totient is φ = 10825008480.

The previous prime is 21716714627. The next prime is 21716714659. The reversal of 21716714644 is 44641761712.

It is a self number, because there is not a number n which added to its sum of digits gives 21716714644.

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, 4715647 + ... + 4720249.

Almost surely, 2^21716714644 is an apocalyptic number.

It is an amenable number.

21716714644 is a deficient number, since it is larger than the sum of its proper divisors (16404368524).

21716714644 is a wasteful number, since it uses less digits than its factorization.

21716714644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7975 (or 7973 counting only the distinct ones).

The product of its digits is 225792, while the sum is 43.

The spelling of 21716714644 in words is "twenty-one billion, seven hundred sixteen million, seven hundred fourteen thousand, six hundred forty-four".