21577532804 has 24 divisors (see below), whose sum is σ = 38069740800. Its totient is φ = 10700776160.

The previous prime is 21577532803. The next prime is 21577532881. The reversal of 21577532804 is 40823577512.

It is a super-2 number, since 2×21577532804² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21577532803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 239789 + ... + 317259.

It is an arithmetic number, because the mean of its divisors is an integer number (1586239200).

Almost surely, 2^21577532804 is an apocalyptic number.

It is an amenable number.

21577532804 is a deficient number, since it is larger than the sum of its proper divisors (16492207996).

21577532804 is a wasteful number, since it uses less digits than its factorization.

21577532804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78043 (or 78041 counting only the distinct ones).

The product of its (nonzero) digits is 470400, while the sum is 44.

The spelling of 21577532804 in words is "twenty-one billion, five hundred seventy-seven million, five hundred thirty-two thousand, eight hundred four".