21398204 has 12 divisors (see below), whose sum is σ = 37484664. Its totient is φ = 10688304.

The previous prime is 21398191. The next prime is 21398227. The reversal of 21398204 is 40289312.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3182 + ... + 7274.

It is an arithmetic number, because the mean of its divisors is an integer number (3123722).

Almost surely, 2^21398204 is an apocalyptic number.

It is an amenable number.

21398204 is a deficient number, since it is larger than the sum of its proper divisors (16086460).

21398204 is a wasteful number, since it uses less digits than its factorization.

21398204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5404 (or 5402 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 21398204 is about 4625.8192787873. The cubic root of 21398204 is about 277.6253428294.

The spelling of 21398204 in words is "twenty-one million, three hundred ninety-eight thousand, two hundred four".