21956636675464 has 32 divisors (see below), whose sum is σ = 42476416848000. Its totient is φ = 10634836185792.

The previous prime is 21956636675453. The next prime is 21956636675473. The reversal of 21956636675464 is 46457663665912.

It is a junction number, because it is equal to n+sod(n) for n = 21956636675393 and 21956636675402.

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, 327716634 + ... + 327783625.

It is an arithmetic number, because the mean of its divisors is an integer number (1327388026500).

Almost surely, 2^{21956636675464} is an apocalyptic number.

It is an amenable number.

21956636675464 is a deficient number, since it is larger than the sum of its proper divisors (20519780172536).

21956636675464 is a wasteful number, since it uses less digits than its factorization.

21956636675464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655500397 (or 655500393 counting only the distinct ones).

The product of its digits is 1175731200, while the sum is 70.

The spelling of 21956636675464 in words is "twenty-one trillion, nine hundred fifty-six billion, six hundred thirty-six million, six hundred seventy-five thousand, four hundred sixty-four".