25531273321 has 2 divisors, whose sum is σ = 25531273322. Its totient is φ = 25531273320.

The previous prime is 25531273309. The next prime is 25531273403. The reversal of 25531273321 is 12337213552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16890641296 + 8640632025 = 129964^2 + 92955^2 .

It is a cyclic number.

It is not a de Polignac number, because 25531273321 - 2²⁹ = 24994402409 is a prime.

It is not a weakly prime, because it can be changed into another prime (25531273021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12765636660 + 12765636661.

It is an arithmetic number, because the mean of its divisors is an integer number (12765636661).

Almost surely, 2^25531273321 is an apocalyptic number.

It is an amenable number.

25531273321 is a deficient number, since it is larger than the sum of its proper divisors (1).

25531273321 is an equidigital number, since it uses as much as digits as its factorization.

25531273321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37800, while the sum is 34.

Adding to 25531273321 its reverse (12337213552), we get a palindrome (37868486873).

The spelling of 25531273321 in words is "twenty-five billion, five hundred thirty-one million, two hundred seventy-three thousand, three hundred twenty-one".