204121100 has 36 divisors (see below), whose sum is σ = 443721600. Its totient is φ = 81504960.

The previous prime is 204121079. The next prime is 204121103. The reversal of 204121100 is 1121402.

204121100 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (204121103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69461 + ... + 72339.

It is an arithmetic number, because the mean of its divisors is an integer number (12325600).

Almost surely, 2^204121100 is an apocalyptic number.

204121100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204121100 is an abundant number, since it is smaller than the sum of its proper divisors (239600500).

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

204121100 is a wasteful number, since it uses less digits than its factorization.

204121100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3602 (or 3595 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 204121100 is about 14287.0955760784. The cubic root of 204121100 is about 588.7929934961.

Adding to 204121100 its reverse (1121402), we get a palindrome (205242502).

It can be divided in two parts, 20412 and 1100, that added together give a palindrome (21512).

The spelling of 204121100 in words is "two hundred four million, one hundred twenty-one thousand, one hundred".