204040621 has 4 divisors (see below), whose sum is σ = 206835772. Its totient is φ = 201245472.

The previous prime is 204040589. The next prime is 204040649. The reversal of 204040621 is 126040402.

204040621 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 101727396 + 102313225 = 10086^2 + 10115^2 .

It is a cyclic number.

It is not a de Polignac number, because 204040621 - 2⁵ = 204040589 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 (204040021) 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, 1397466 + ... + 1397611.

It is an arithmetic number, because the mean of its divisors is an integer number (51708943).

Almost surely, 2^204040621 is an apocalyptic number.

It is an amenable number.

204040621 is a deficient number, since it is larger than the sum of its proper divisors (2795151).

204040621 is an equidigital number, since it uses as much as digits as its factorization.

204040621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2795150.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 204040621 is about 14284.2788057360. The cubic root of 204040621 is about 588.7156020190.

The spelling of 204040621 in words is "two hundred four million, forty thousand, six hundred twenty-one".