204340121 has 4 divisors (see below), whose sum is σ = 205006032. Its totient is φ = 203674212.

The previous prime is 204340111. The next prime is 204340133. The reversal of 204340121 is 121043402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 204340121 - 2¹⁰ = 204339097 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 204340121.

It is not an unprimeable number, because it can be changed into a prime (204340111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 332495 + ... + 333108.

It is an arithmetic number, because the mean of its divisors is an integer number (51251508).

Almost surely, 2^204340121 is an apocalyptic number.

It is an amenable number.

204340121 is a deficient number, since it is larger than the sum of its proper divisors (665911).

204340121 is an equidigital number, since it uses as much as digits as its factorization.

204340121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665910.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 204340121 is about 14294.7585149243. The cubic root of 204340121 is about 589.0035089432.

Adding to 204340121 its reverse (121043402), we get a palindrome (325383523).

The spelling of 204340121 in words is "two hundred four million, three hundred forty thousand, one hundred twenty-one".