25457221 has 8 divisors (see below), whose sum is σ = 26703360. Its totient is φ = 24240528.

The previous prime is 25457213. The next prime is 25457233. The reversal of 25457221 is 12275452.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25457221 - 2³ = 25457213 is a prime.

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 25457221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25457281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5581 + ... + 9058.

It is an arithmetic number, because the mean of its divisors is an integer number (3337920).

Almost surely, 2^25457221 is an apocalyptic number.

It is an amenable number.

25457221 is a deficient number, since it is larger than the sum of its proper divisors (1246139).

25457221 is a wasteful number, since it uses less digits than its factorization.

25457221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14723.

The product of its digits is 5600, while the sum is 28.

The square root of 25457221 is about 5045.5149390325. The cubic root of 25457221 is about 294.1735789887.

It can be divided in two parts, 254 and 57221, that added together give a palindrome (57475).

The spelling of 25457221 in words is "twenty-five million, four hundred fifty-seven thousand, two hundred twenty-one".