21213339904 has 27 divisors (see below), whose sum is σ = 42348467343. Its totient is φ = 10605504768.

The previous prime is 21213339899. The next prime is 21213339919. The reversal of 21213339904 is 40993331212.

The square root of 21213339904 is 145648.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

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 2 ways as a sum of consecutive naturals, for example, 2325817 + ... + 2334919.

Almost surely, 2^21213339904 is an apocalyptic number.

21213339904 is the 145648-th square number.

It is an amenable number.

21213339904 is a deficient number, since it is larger than the sum of its proper divisors (21135127439).

21213339904 is an frugal number, since it uses more digits than its factorization.

21213339904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18222 (or 9105 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 37.

The spelling of 21213339904 in words is "twenty-one billion, two hundred thirteen million, three hundred thirty-nine thousand, nine hundred four".