25321240523221 has 4 divisors (see below), whose sum is σ = 25514532435744. Its totient is φ = 25127948610700.

The previous prime is 25321240523177. The next prime is 25321240523233. The reversal of 25321240523221 is 12232504212352.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25321240523221 - 2⁷ = 25321240523093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25321240523281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96645956065 + ... + 96645956326.

It is an arithmetic number, because the mean of its divisors is an integer number (6378633108936).

Almost surely, 2^{25321240523221} is an apocalyptic number.

It is an amenable number.

25321240523221 is a deficient number, since it is larger than the sum of its proper divisors (193291912523).

25321240523221 is a wasteful number, since it uses less digits than its factorization.

25321240523221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193291912522.

The product of its (nonzero) digits is 57600, while the sum is 34.

Adding to 25321240523221 its reverse (12232504212352), we get a palindrome (37553744735573).

The spelling of 25321240523221 in words is "twenty-five trillion, three hundred twenty-one billion, two hundred forty million, five hundred twenty-three thousand, two hundred twenty-one".