21772705264 has 40 divisors (see below), whose sum is σ = 44836039040. Its totient is φ = 10213242048.

The previous prime is 21772705249. The next prime is 21772705343. The reversal of 21772705264 is 46250727712.

It is a self number, because there is not a number n which added to its sum of digits gives 21772705264.

It is a congruent number.

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, 316362 + ... + 378985.

It is an arithmetic number, because the mean of its divisors is an integer number (1120900976).

Almost surely, 2^21772705264 is an apocalyptic number.

It is an amenable number.

21772705264 is an abundant number, since it is smaller than the sum of its proper divisors (23063333776).

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

21772705264 is a wasteful number, since it uses less digits than its factorization.

21772705264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695477 (or 695471 counting only the distinct ones).

The product of its (nonzero) digits is 329280, while the sum is 43.

The spelling of 21772705264 in words is "twenty-one billion, seven hundred seventy-two million, seven hundred five thousand, two hundred sixty-four".