204221556 has 72 divisors (see below), whose sum is σ = 643616064. Its totient is φ = 53043840.

The previous prime is 204221543. The next prime is 204221579. The reversal of 204221556 is 655122402.

204221556 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×204221556² = 83412887870122272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34065 + ... + 39608.

It is an arithmetic number, because the mean of its divisors is an integer number (8939112).

Almost surely, 2^204221556 is an apocalyptic number.

It is an amenable number.

204221556 is an abundant number, since it is smaller than the sum of its proper divisors (439394508).

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

204221556 is a wasteful number, since it uses less digits than its factorization.

204221556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73701 (or 73696 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 204221556 is about 14290.6107637148. The cubic root of 204221556 is about 588.8895670311.

Adding to 204221556 its reverse (655122402), we get a palindrome (859343958).

The spelling of 204221556 in words is "two hundred four million, two hundred twenty-one thousand, five hundred fifty-six".