204221904 has 20 divisors (see below), whose sum is σ = 527573376. Its totient is φ = 68073952.

The previous prime is 204221891. The next prime is 204221917. The reversal of 204221904 is 409122402.

204221904 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (204221891) and next prime (204221917).

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 2127264 + ... + 2127359.

Almost surely, 2^204221904 is an apocalyptic number.

204221904 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

204221904 is an abundant number, since it is smaller than the sum of its proper divisors (323351472).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

204221904 is a wasteful number, since it uses less digits than its factorization.

204221904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4254634 (or 4254628 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 204221904 is about 14290.6229395363. The cubic root of 204221904 is about 588.8899015264.

The spelling of 204221904 in words is "two hundred four million, two hundred twenty-one thousand, nine hundred four".