205251304121027 has 2 divisors, whose sum is σ = 205251304121028. Its totient is φ = 205251304121026.

The previous prime is 205251304120987. The next prime is 205251304121029. The reversal of 205251304121027 is 720121403152502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205251304121027 - 2²⁴ = 205251287343811 is a prime.

Together with 205251304121029, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (205251304121029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102625652060513 + 102625652060514.

It is an arithmetic number, because the mean of its divisors is an integer number (102625652060514).

Almost surely, 2^{205251304121027} is an apocalyptic number.

205251304121027 is a deficient number, since it is larger than the sum of its proper divisors (1).

205251304121027 is an equidigital number, since it uses as much as digits as its factorization.

205251304121027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 33600, while the sum is 35.

Adding to 205251304121027 its reverse (720121403152502), we get a palindrome (925372707273529).

The spelling of 205251304121027 in words is "two hundred five trillion, two hundred fifty-one billion, three hundred four million, one hundred twenty-one thousand, twenty-seven".