204121131223129 has 2 divisors, whose sum is σ = 204121131223130. Its totient is φ = 204121131223128.

The previous prime is 204121131223091. The next prime is 204121131223159. The reversal of 204121131223129 is 921322131121402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 142724190438729 + 61396940784400 = 11946723^2 + 7835620^2 .

It is a cyclic number.

It is not a de Polignac number, because 204121131223129 - 2¹¹ = 204121131221081 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 204121131223094 and 204121131223103.

It is not a weakly prime, because it can be changed into another prime (204121131223159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102060565611564 + 102060565611565.

It is an arithmetic number, because the mean of its divisors is an integer number (102060565611565).

Almost surely, 2^{204121131223129} is an apocalyptic number.

It is an amenable number.

204121131223129 is a deficient number, since it is larger than the sum of its proper divisors (1).

204121131223129 is an equidigital number, since it uses as much as digits as its factorization.

204121131223129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 34.

The spelling of 204121131223129 in words is "two hundred four trillion, one hundred twenty-one billion, one hundred thirty-one million, two hundred twenty-three thousand, one hundred twenty-nine".