204121134 has 40 divisors (see below), whose sum is σ = 522725808. Its totient is φ = 58320000.

The previous prime is 204121133. The next prime is 204121201. The reversal of 204121134 is 431121402.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204121133) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 88867 + ... + 91134.

Almost surely, 2^204121134 is an apocalyptic number.

204121134 is an abundant number, since it is smaller than the sum of its proper divisors (318604674).

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

204121134 is a wasteful number, since it uses less digits than its factorization.

204121134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180022 (or 180013 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 204121134 is about 14287.0967659633. The cubic root of 204121134 is about 588.7930261874.

Adding to 204121134 its reverse (431121402), we get a palindrome (635242536).

The spelling of 204121134 in words is "two hundred four million, one hundred twenty-one thousand, one hundred thirty-four".