204002434121 has 2 divisors, whose sum is σ = 204002434122. Its totient is φ = 204002434120.

The previous prime is 204002434093. The next prime is 204002434159. The reversal of 204002434121 is 121434200402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 167964727225 + 36037706896 = 409835^2 + 189836^2 .

It is a cyclic number.

It is not a de Polignac number, because 204002434121 - 2¹⁸ = 204002171977 is a prime.

It is not a weakly prime, because it can be changed into another prime (204002464121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102001217060 + 102001217061.

It is an arithmetic number, because the mean of its divisors is an integer number (102001217061).

Almost surely, 2^204002434121 is an apocalyptic number.

It is an amenable number.

204002434121 is a deficient number, since it is larger than the sum of its proper divisors (1).

204002434121 is an equidigital number, since it uses as much as digits as its factorization.

204002434121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 204002434121 its reverse (121434200402), we get a palindrome (325436634523).

The spelling of 204002434121 in words is "two hundred four billion, two million, four hundred thirty-four thousand, one hundred twenty-one".