204660221 has 4 divisors (see below), whose sum is σ = 211717500. Its totient is φ = 197602944.

The previous prime is 204660193. The next prime is 204660227. The reversal of 204660221 is 122066402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 147355321 + 57304900 = 12139^2 + 7570^2 .

It is a cyclic number.

It is not a de Polignac number, because 204660221 - 2²⁶ = 137551357 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 (204660227) 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, 3528596 + ... + 3528653.

It is an arithmetic number, because the mean of its divisors is an integer number (52929375).

Almost surely, 2^204660221 is an apocalyptic number.

It is an amenable number.

204660221 is a deficient number, since it is larger than the sum of its proper divisors (7057279).

204660221 is an equidigital number, since it uses as much as digits as its factorization.

204660221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7057278.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 204660221 is about 14305.9505451403. The cubic root of 204660221 is about 589.3109076374.

The spelling of 204660221 in words is "two hundred four million, six hundred sixty thousand, two hundred twenty-one".