204361021 has 4 divisors (see below), whose sum is σ = 210953344. Its totient is φ = 197768700.

The previous prime is 204361019. The next prime is 204361033. The reversal of 204361021 is 120163402.

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 a cyclic number.

It is not a de Polignac number, because 204361021 - 2¹ = 204361019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 204361021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204361051) 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, 3296115 + ... + 3296176.

It is an arithmetic number, because the mean of its divisors is an integer number (52738336).

Almost surely, 2^204361021 is an apocalyptic number.

It is an amenable number.

204361021 is a deficient number, since it is larger than the sum of its proper divisors (6592323).

204361021 is an equidigital number, since it uses as much as digits as its factorization.

204361021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6592322.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 204361021 is about 14295.4895334158. The cubic root of 204361021 is about 589.0235894404.

The spelling of 204361021 in words is "two hundred four million, three hundred sixty-one thousand, twenty-one".