25256221 has 4 divisors (see below), whose sum is σ = 25576000. Its totient is φ = 24936444.

The previous prime is 25256207. The next prime is 25256243. The reversal of 25256221 is 12265252.

It is a happy number.

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 25256221 - 2¹³ = 25248029 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 (25256201) 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, 159771 + ... + 159928.

It is an arithmetic number, because the mean of its divisors is an integer number (6394000).

Almost surely, 2^25256221 is an apocalyptic number.

It is an amenable number.

25256221 is a deficient number, since it is larger than the sum of its proper divisors (319779).

25256221 is an equidigital number, since it uses as much as digits as its factorization.

25256221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319778.

The product of its digits is 2400, while the sum is 25.

The square root of 25256221 is about 5025.5567850737. The cubic root of 25256221 is about 293.3973068401.

The spelling of 25256221 in words is "twenty-five million, two hundred fifty-six thousand, two hundred twenty-one".