204221 has 8 divisors (see below), whose sum is σ = 222264. Its totient is φ = 186880.

The previous prime is 204173. The next prime is 204233. The reversal of 204221 is 122402.

It can be written as a sum of positive squares in 4 ways, for example, as 52900 + 151321 = 230^2 + 389^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 551 + ... + 843.

It is an arithmetic number, because the mean of its divisors is an integer number (27783).

2²⁰⁴²²¹ is an apocalyptic number.

It is an amenable number.

204221 is a deficient number, since it is larger than the sum of its proper divisors (18043).

204221 is a wasteful number, since it uses less digits than its factorization.

204221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351.

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 204221 is about 451.9081765138. The cubic root of 204221 is about 58.8889032607. Note that the first 3 decimals are identical.

Adding to 204221 its reverse (122402), we get a palindrome (326623).

The spelling of 204221 in words is "two hundred four thousand, two hundred twenty-one", and thus it is an iban number.