25232221 has 4 divisors (see below), whose sum is σ = 28836832. Its totient is φ = 21627612.

The previous prime is 25232213. The next prime is 25232239. The reversal of 25232221 is 12223252.

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 25232221 - 2³ = 25232213 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 (25232321) 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, 1802295 + ... + 1802308.

It is an arithmetic number, because the mean of its divisors is an integer number (7209208).

Almost surely, 2^25232221 is an apocalyptic number.

It is an amenable number.

25232221 is a deficient number, since it is larger than the sum of its proper divisors (3604611).

25232221 is an equidigital number, since it uses as much as digits as its factorization.

25232221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3604610.

The product of its digits is 480, while the sum is 19.

The square root of 25232221 is about 5023.1684224203. The cubic root of 25232221 is about 293.3043427215.

Adding to 25232221 its reverse (12223252), we get a palindrome (37455473).

The spelling of 25232221 in words is "twenty-five million, two hundred thirty-two thousand, two hundred twenty-one".