204121434 has 24 divisors (see below), whose sum is σ = 448731360. Its totient is φ = 61854760.

The previous prime is 204121417. The next prime is 204121447. The reversal of 204121434 is 434121402.

It is a self number, because there is not a number n which added to its sum of digits gives 204121434.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 139854 + ... + 141305.

It is an arithmetic number, because the mean of its divisors is an integer number (18697140).

Almost surely, 2^204121434 is an apocalyptic number.

204121434 is an abundant number, since it is smaller than the sum of its proper divisors (244609926).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

204121434 is a wasteful number, since it uses less digits than its factorization.

204121434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281186 (or 281175 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 204121434 is about 14287.1072649435. The cubic root of 204121434 is about 588.7933146400.

Adding to 204121434 its reverse (434121402), we get a palindrome (638242836).

The spelling of 204121434 in words is "two hundred four million, one hundred twenty-one thousand, four hundred thirty-four".