204316221 has 4 divisors (see below), whose sum is σ = 272421632. Its totient is φ = 136210812.

The previous prime is 204316213. The next prime is 204316271. The reversal of 204316221 is 122613402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 204316221 - 2³ = 204316213 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204316201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34052701 + ... + 34052706.

It is an arithmetic number, because the mean of its divisors is an integer number (68105408).

Almost surely, 2^204316221 is an apocalyptic number.

It is an amenable number.

204316221 is a deficient number, since it is larger than the sum of its proper divisors (68105411).

204316221 is an equidigital number, since it uses as much as digits as its factorization.

204316221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68105410.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 204316221 is about 14293.9225197284. The cubic root of 204316221 is about 588.9805443998.

Adding to 204316221 its reverse (122613402), we get a palindrome (326929623).

The spelling of 204316221 in words is "two hundred four million, three hundred sixteen thousand, two hundred twenty-one".