21904244884 has 12 divisors (see below), whose sum is σ = 38334217824. Its totient is φ = 10951611224.

The previous prime is 21904244839. The next prime is 21904244893. The reversal of 21904244884 is 48844240912.

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, 21592 + ... + 210415.

It is an arithmetic number, because the mean of its divisors is an integer number (3194518152).

Almost surely, 2^21904244884 is an apocalyptic number.

It is an amenable number.

21904244884 is a deficient number, since it is larger than the sum of its proper divisors (16429972940).

21904244884 is a wasteful number, since it uses less digits than its factorization.

21904244884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255614 (or 255612 counting only the distinct ones).

The product of its (nonzero) digits is 589824, while the sum is 46.

The spelling of 21904244884 in words is "twenty-one billion, nine hundred four million, two hundred forty-four thousand, eight hundred eighty-four".