204151221 has 12 divisors (see below), whose sum is σ = 301159872. Its totient is φ = 133204776.

The previous prime is 204151217. The next prime is 204151231. The reversal of 204151221 is 122151402.

204151221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 204151221 - 2² = 204151217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 204151194 and 204151203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204151231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 240891 + ... + 241736.

It is an arithmetic number, because the mean of its divisors is an integer number (25096656).

Almost surely, 2^204151221 is an apocalyptic number.

It is an amenable number.

204151221 is a deficient number, since it is larger than the sum of its proper divisors (97008651).

204151221 is a wasteful number, since it uses less digits than its factorization.

204151221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482680 (or 482677 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 204151221 is about 14288.1496702687. The cubic root of 204151221 is about 588.8219536925.

The spelling of 204151221 in words is "two hundred four million, one hundred fifty-one thousand, two hundred twenty-one".