25072221 has 12 divisors (see below), whose sum is σ = 33755936. Its totient is φ = 16553160.

The previous prime is 25072219. The next prime is 25072253. The reversal of 25072221 is 12227052.

It is a happy number.

It is not a de Polignac number, because 25072221 - 2¹ = 25072219 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 (25072261) 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, 51240 + ... + 51726.

Almost surely, 2^25072221 is an apocalyptic number.

It is an amenable number.

25072221 is a deficient number, since it is larger than the sum of its proper divisors (8683715).

25072221 is an equidigital number, since it uses as much as digits as its factorization.

25072221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 752 (or 621 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 25072221 is about 5007.2168916475. The cubic root of 25072221 is about 292.6830704347.

Adding to 25072221 its reverse (12227052), we get a palindrome (37299273).

The spelling of 25072221 in words is "twenty-five million, seventy-two thousand, two hundred twenty-one".