25872221 has 4 divisors (see below), whose sum is σ = 25903200. Its totient is φ = 25841244.

The previous prime is 25872199. The next prime is 25872233. The reversal of 25872221 is 12227852.

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 25872221 - 2⁶ = 25872157 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 (25872241) 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, 14201 + ... + 15918.

It is an arithmetic number, because the mean of its divisors is an integer number (6475800).

Almost surely, 2^25872221 is an apocalyptic number.

It is an amenable number.

25872221 is a deficient number, since it is larger than the sum of its proper divisors (30979).

25872221 is an equidigital number, since it uses as much as digits as its factorization.

25872221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30978.

The product of its digits is 4480, while the sum is 29.

The square root of 25872221 is about 5086.4743192117. The cubic root of 25872221 is about 295.7634957984.

The spelling of 25872221 in words is "twenty-five million, eight hundred seventy-two thousand, two hundred twenty-one".