21904224976 has 30 divisors (see below), whose sum is σ = 42513360630. Its totient is φ = 10933066368.

The previous prime is 21904224967. The next prime is 21904225081. The reversal of 21904224976 is 67942240912.

It can be written as a sum of positive squares in 3 ways, for example, as 2825985600 + 19078239376 = 53160^2 + 138124^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9167590 + ... + 9169978.

It is an arithmetic number, because the mean of its divisors is an integer number (1417112021).

Almost surely, 2^21904224976 is an apocalyptic number.

It is an amenable number.

21904224976 is a deficient number, since it is larger than the sum of its proper divisors (20609135654).

21904224976 is an frugal number, since it uses more digits than its factorization.

21904224976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3911 (or 3148 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 46.

The spelling of 21904224976 in words is "twenty-one billion, nine hundred four million, two hundred twenty-four thousand, nine hundred seventy-six".