204517121 has 4 divisors (see below), whose sum is σ = 215281200. Its totient is φ = 193753044.

The previous prime is 204517099. The next prime is 204517147. The reversal of 204517121 is 121715402.

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 204517121 - 2¹⁰ = 204516097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204517421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5382011 + ... + 5382048.

It is an arithmetic number, because the mean of its divisors is an integer number (53820300).

Almost surely, 2^204517121 is an apocalyptic number.

It is an amenable number.

204517121 is a deficient number, since it is larger than the sum of its proper divisors (10764079).

204517121 is a wasteful number, since it uses less digits than its factorization.

204517121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10764078.

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 204517121 is about 14300.9482552731. The cubic root of 204517121 is about 589.1735253737.

It can be divided in two parts, 20451 and 7121, that added together give a palindrome (27572).

The spelling of 204517121 in words is "two hundred four million, five hundred seventeen thousand, one hundred twenty-one".