252561160750021 has 2 divisors, whose sum is σ = 252561160750022. Its totient is φ = 252561160750020.

The previous prime is 252561160750013. The next prime is 252561160750027. The reversal of 252561160750021 is 120057061165252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 143999640000225 + 108561520749796 = 11999985^2 + 10419286^2 .

It is a cyclic number.

It is not a de Polignac number, because 252561160750021 - 2³ = 252561160750013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 252561160750021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (252561160750027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126280580375010 + 126280580375011.

It is an arithmetic number, because the mean of its divisors is an integer number (126280580375011).

Almost surely, 2^{252561160750021} is an apocalyptic number.

It is an amenable number.

252561160750021 is a deficient number, since it is larger than the sum of its proper divisors (1).

252561160750021 is an equidigital number, since it uses as much as digits as its factorization.

252561160750021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252000, while the sum is 43.

The spelling of 252561160750021 in words is "two hundred fifty-two trillion, five hundred sixty-one billion, one hundred sixty million, seven hundred fifty thousand, twenty-one".