204121900 has 36 divisors (see below), whose sum is σ = 448299432. Its totient is φ = 80661760.

The previous prime is 204121889. The next prime is 204121913. The reversal of 204121900 is 9121402.

It is a super-2 number, since 2×204121900² = 83331500119220000, which contains 22 as substring.

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, 3997 + ... + 20596.

It is an arithmetic number, because the mean of its divisors is an integer number (12452762).

Almost surely, 2^204121900 is an apocalyptic number.

204121900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204121900 is an abundant number, since it is smaller than the sum of its proper divisors (244177532).

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

204121900 is a wasteful number, since it uses less digits than its factorization.

204121900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24690 (or 24683 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 204121900 is about 14287.1235733439. The cubic root of 204121900 is about 588.7937627025.

The spelling of 204121900 in words is "two hundred four million, one hundred twenty-one thousand, nine hundred".