204502434121 has 4 divisors (see below), whose sum is σ = 205644906000. Its totient is φ = 203359962244.

The previous prime is 204502434107. The next prime is 204502434131. The reversal of 204502434121 is 121434205402.

204502434121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 204502434121 - 2⁹ = 204502433609 is a prime.

It is a super-2 number, since 2×204502434121² (a number of 23 digits) contains 22 as substring.

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 204502434121.

It is not an unprimeable number, because it can be changed into a prime (204502434131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 571235671 + ... + 571236028.

It is an arithmetic number, because the mean of its divisors is an integer number (51411226500).

Almost surely, 2^204502434121 is an apocalyptic number.

It is an amenable number.

204502434121 is a deficient number, since it is larger than the sum of its proper divisors (1142471879).

204502434121 is a wasteful number, since it uses less digits than its factorization.

204502434121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1142471878.

The product of its (nonzero) digits is 7680, while the sum is 28.

Adding to 204502434121 its reverse (121434205402), we get a palindrome (325936639523).

The spelling of 204502434121 in words is "two hundred four billion, five hundred two million, four hundred thirty-four thousand, one hundred twenty-one".