204660921 has 4 divisors (see below), whose sum is σ = 272881232. Its totient is φ = 136440612.

The previous prime is 204660919. The next prime is 204661003. The reversal of 204660921 is 129066402.

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 204660921 - 2¹ = 204660919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204660901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34110151 + ... + 34110156.

It is an arithmetic number, because the mean of its divisors is an integer number (68220308).

Almost surely, 2^204660921 is an apocalyptic number.

It is an amenable number.

204660921 is a deficient number, since it is larger than the sum of its proper divisors (68220311).

204660921 is an equidigital number, since it uses as much as digits as its factorization.

204660921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68220310.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 204660921 is about 14305.9750104633. The cubic root of 204660921 is about 589.3115795106.

The spelling of 204660921 in words is "two hundred four million, six hundred sixty thousand, nine hundred twenty-one".