25252221 has 16 divisors (see below), whose sum is σ = 34499520. Its totient is φ = 16423680.

The previous prime is 25252193. The next prime is 25252247. The reversal of 25252221 is 12225252.

It is not a de Polignac number, because 25252221 - 2⁵ = 25252189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25252921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37990 + ... + 38648.

It is an arithmetic number, because the mean of its divisors is an integer number (2156220).

Almost surely, 2^25252221 is an apocalyptic number.

It is an amenable number.

25252221 is a deficient number, since it is larger than the sum of its proper divisors (9247299).

25252221 is a wasteful number, since it uses less digits than its factorization.

25252221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 956.

The product of its digits is 800, while the sum is 21.

The square root of 25252221 is about 5025.1588034608. The cubic root of 25252221 is about 293.3818169113.

Adding to 25252221 its reverse (12225252), we get a palindrome (37477473).

The spelling of 25252221 in words is "twenty-five million, two hundred fifty-two thousand, two hundred twenty-one".