21713982770856 has 64 divisors (see below), whose sum is σ = 58124012140800. Its totient is φ = 6735687968768.

The previous prime is 21713982770789. The next prime is 21713982770897. The reversal of 21713982770856 is 65807728931712.

It is a super-2 number, since 2×21713982770856² (a number of 27 digits) contains 22 as substring.

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, 298955520 + ... + 299028143.

It is an arithmetic number, because the mean of its divisors is an integer number (908187689700).

Almost surely, 2^{21713982770856} is an apocalyptic number.

It is an amenable number.

21713982770856 is an abundant number, since it is smaller than the sum of its proper divisors (36410029369944).

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

21713982770856 is a wasteful number, since it uses less digits than its factorization.

21713982770856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 597983778 (or 597983774 counting only the distinct ones).

The product of its (nonzero) digits is 71124480, while the sum is 66.

The spelling of 21713982770856 in words is "twenty-one trillion, seven hundred thirteen billion, nine hundred eighty-two million, seven hundred seventy thousand, eight hundred fifty-six".