204006621 has 16 divisors (see below), whose sum is σ = 334780544. Its totient is φ = 107607744.

The previous prime is 204006599. The next prime is 204006653. The reversal of 204006621 is 126600402.

It is a happy number.

204006621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 204006621 - 2⁵ = 204006589 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204006661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 373366 + ... + 373911.

It is an arithmetic number, because the mean of its divisors is an integer number (20923784).

Almost surely, 2^204006621 is an apocalyptic number.

204006621 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

204006621 is a deficient number, since it is larger than the sum of its proper divisors (130773923).

204006621 is a wasteful number, since it uses less digits than its factorization.

204006621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 747300.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 204006621 is about 14283.0886365660. The cubic root of 204006621 is about 588.6829002915.

The spelling of 204006621 in words is "two hundred four million, six thousand, six hundred twenty-one".