25325231221 has 4 divisors (see below), whose sum is σ = 25325646700. Its totient is φ = 25324815744.

The previous prime is 25325231209. The next prime is 25325231237. The reversal of 25325231221 is 12213252352.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20338752996 + 4986478225 = 142614^2 + 70615^2 .

It is a cyclic number.

It is not a de Polignac number, because 25325231221 - 2⁷ = 25325231093 is a prime.

It is a super-2 number, since 2×25325231221² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25325231221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25325231251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96426 + ... + 244843.

It is an arithmetic number, because the mean of its divisors is an integer number (6331411675).

Almost surely, 2^25325231221 is an apocalyptic number.

It is an amenable number.

25325231221 is a deficient number, since it is larger than the sum of its proper divisors (415479).

25325231221 is an equidigital number, since it uses as much as digits as its factorization.

25325231221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415478.

The product of its digits is 7200, while the sum is 28.

Adding to 25325231221 its reverse (12213252352), we get a palindrome (37538483573).

The spelling of 25325231221 in words is "twenty-five billion, three hundred twenty-five million, two hundred thirty-one thousand, two hundred twenty-one".