25312652821 has 2 divisors, whose sum is σ = 25312652822. Its totient is φ = 25312652820.

The previous prime is 25312652791. The next prime is 25312652831. The reversal of 25312652821 is 12825621352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15584775921 + 9727876900 = 124839^2 + 98630^2 .

It is a cyclic number.

It is not a de Polignac number, because 25312652821 - 2²³ = 25304264213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25312652831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12656326410 + 12656326411.

It is an arithmetic number, because the mean of its divisors is an integer number (12656326411).

Almost surely, 2^25312652821 is an apocalyptic number.

It is an amenable number.

25312652821 is a deficient number, since it is larger than the sum of its proper divisors (1).

25312652821 is an equidigital number, since it uses as much as digits as its factorization.

25312652821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 57600, while the sum is 37.

The spelling of 25312652821 in words is "twenty-five billion, three hundred twelve million, six hundred fifty-two thousand, eight hundred twenty-one".