204536021 has 4 divisors (see below), whose sum is σ = 205414092. Its totient is φ = 203657952.

The previous prime is 204535967. The next prime is 204536023. The reversal of 204536021 is 120635402.

204536021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 11464996 + 193071025 = 3386^2 + 13895^2 .

It is a cyclic number.

It is not a de Polignac number, because 204536021 - 2¹⁰ = 204534997 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 (204536023) 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, 438686 + ... + 439151.

It is an arithmetic number, because the mean of its divisors is an integer number (51353523).

Almost surely, 2^204536021 is an apocalyptic number.

It is an amenable number.

204536021 is a deficient number, since it is larger than the sum of its proper divisors (878071).

204536021 is an equidigital number, since it uses as much as digits as its factorization.

204536021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 878070.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 204536021 is about 14301.6090353498. The cubic root of 204536021 is about 589.1916738733.

The spelling of 204536021 in words is "two hundred four million, five hundred thirty-six thousand, twenty-one".