25510431321 has 12 divisors (see below), whose sum is σ = 36870660372. Its totient is φ = 16996680576.

The previous prime is 25510431313. The next prime is 25510431341. The reversal of 25510431321 is 12313401552.

It can be written as a sum of positive squares in 2 ways, for example, as 18245255625 + 7265175696 = 135075^2 + 85236^2 .

It is not a de Polignac number, because 25510431321 - 2³ = 25510431313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25510431341) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 840396 + ... + 870221.

It is an arithmetic number, because the mean of its divisors is an integer number (3072555031).

Almost surely, 2^25510431321 is an apocalyptic number.

It is an amenable number.

25510431321 is a deficient number, since it is larger than the sum of its proper divisors (11360229051).

25510431321 is a wasteful number, since it uses less digits than its factorization.

25510431321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1712280 (or 1712277 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

Adding to 25510431321 its reverse (12313401552), we get a palindrome (37823832873).

The spelling of 25510431321 in words is "twenty-five billion, five hundred ten million, four hundred thirty-one thousand, three hundred twenty-one".