21576158056 has 32 divisors (see below), whose sum is σ = 43027165440. Its totient is φ = 10107940608.

The previous prime is 21576158041. The next prime is 21576158063. The reversal of 21576158056 is 65085167512.

It is a junction number, because it is equal to n+sod(n) for n = 21576157997 and 21576158015.

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, 325386 + ... + 386041.

It is an arithmetic number, because the mean of its divisors is an integer number (1344598920).

Almost surely, 2^21576158056 is an apocalyptic number.

It is an amenable number.

21576158056 is a deficient number, since it is larger than the sum of its proper divisors (21451007384).

21576158056 is a wasteful number, since it uses less digits than its factorization.

21576158056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711673 (or 711669 counting only the distinct ones).

The product of its (nonzero) digits is 504000, while the sum is 46.

The spelling of 21576158056 in words is "twenty-one billion, five hundred seventy-six million, one hundred fifty-eight thousand, fifty-six".