21945463056 has 80 divisors (see below), whose sum is σ = 68718131520. Its totient is φ = 6650138880.

The previous prime is 21945463003. The next prime is 21945463061. The reversal of 21945463056 is 65036454912.

21945463056 is a `hidden beast` number, since 2 + 1 + 9 + 4 + 5 + 4 + 630 + 5 + 6 = 666.

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, 2304325 + ... + 2313828.

It is an arithmetic number, because the mean of its divisors is an integer number (858976644).

Almost surely, 2^21945463056 is an apocalyptic number.

It is an amenable number.

21945463056 is an abundant number, since it is smaller than the sum of its proper divisors (46772668464).

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

21945463056 is a wasteful number, since it uses less digits than its factorization.

21945463056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4618181 (or 4618169 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The spelling of 21945463056 in words is "twenty-one billion, nine hundred forty-five million, four hundred sixty-three thousand, fifty-six".