252640025021 has 2 divisors, whose sum is σ = 252640025022. Its totient is φ = 252640025020.

The previous prime is 252640024927. The next prime is 252640025039. The reversal of 252640025021 is 120520046252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 202347028900 + 50292996121 = 449830^2 + 224261^2 .

It is a cyclic number.

It is not a de Polignac number, because 252640025021 - 2²² = 252635830717 is a prime.

It is a super-2 number, since 2×252640025021² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (252640025041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126320012510 + 126320012511.

It is an arithmetic number, because the mean of its divisors is an integer number (126320012511).

Almost surely, 2^252640025021 is an apocalyptic number.

It is an amenable number.

252640025021 is a deficient number, since it is larger than the sum of its proper divisors (1).

252640025021 is an equidigital number, since it uses as much as digits as its factorization.

252640025021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9600, while the sum is 29.

The spelling of 252640025021 in words is "two hundred fifty-two billion, six hundred forty million, twenty-five thousand, twenty-one".