25115321321 has 2 divisors, whose sum is σ = 25115321322. Its totient is φ = 25115321320.

The previous prime is 25115321299. The next prime is 25115321347. The reversal of 25115321321 is 12312351152.

It is an a-pointer prime, because the next prime (25115321347) can be obtained adding 25115321321 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19667257600 + 5448063721 = 140240^2 + 73811^2 .

It is a cyclic number.

It is not a de Polignac number, because 25115321321 - 2²⁶ = 25048212457 is a prime.

It is not a weakly prime, because it can be changed into another prime (25115321221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12557660660 + 12557660661.

It is an arithmetic number, because the mean of its divisors is an integer number (12557660661).

Almost surely, 2^25115321321 is an apocalyptic number.

It is an amenable number.

25115321321 is a deficient number, since it is larger than the sum of its proper divisors (1).

25115321321 is an equidigital number, since it uses as much as digits as its factorization.

25115321321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1800, while the sum is 26.

Adding to 25115321321 its reverse (12312351152), we get a palindrome (37427672473).

The spelling of 25115321321 in words is "twenty-five billion, one hundred fifteen million, three hundred twenty-one thousand, three hundred twenty-one".