21713727688 has 16 divisors (see below), whose sum is σ = 40725630000. Its totient is φ = 10853559696.

The previous prime is 21713727661. The next prime is 21713727719. The reversal of 21713727688 is 88672731712.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 384978 + ... + 437761.

It is an arithmetic number, because the mean of its divisors is an integer number (2545351875).

Almost surely, 2^21713727688 is an apocalyptic number.

It is an amenable number.

21713727688 is a deficient number, since it is larger than the sum of its proper divisors (19011902312).

21713727688 is a wasteful number, since it uses less digits than its factorization.

21713727688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 826044 (or 826040 counting only the distinct ones).

The product of its digits is 1580544, while the sum is 52.

The spelling of 21713727688 in words is "twenty-one billion, seven hundred thirteen million, seven hundred twenty-seven thousand, six hundred eighty-eight".