21393304 has 16 divisors (see below), whose sum is σ = 40194720. Its totient is φ = 10674720.

The previous prime is 21393299. The next prime is 21393313. The reversal of 21393304 is 40339312.

It is a happy number.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 1857 + ... + 6799.

It is an arithmetic number, because the mean of its divisors is an integer number (2512170).

Almost surely, 2^21393304 is an apocalyptic number.

It is an amenable number.

21393304 is a deficient number, since it is larger than the sum of its proper divisors (18801416).

21393304 is a wasteful number, since it uses less digits than its factorization.

21393304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5490 (or 5486 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 25.

The square root of 21393304 is about 4625.2896125540. The cubic root of 21393304 is about 277.6041499600.

The spelling of 21393304 in words is "twenty-one million, three hundred ninety-three thousand, three hundred four".