21577532764 has 12 divisors (see below), whose sum is σ = 38978769088. Its totient is φ = 10440741600.

The previous prime is 21577532729. The next prime is 21577532803. The reversal of 21577532764 is 46723577512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87006057 + ... + 87006304.

Almost surely, 2^21577532764 is an apocalyptic number.

It is an amenable number.

21577532764 is a deficient number, since it is larger than the sum of its proper divisors (17401236324).

21577532764 is a wasteful number, since it uses less digits than its factorization.

21577532764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174012396 (or 174012394 counting only the distinct ones).

The product of its digits is 2469600, while the sum is 49.

The spelling of 21577532764 in words is "twenty-one billion, five hundred seventy-seven million, five hundred thirty-two thousand, seven hundred sixty-four".