25365621 has 4 divisors (see below), whose sum is σ = 33820832. Its totient is φ = 16910412.

The previous prime is 25365607. The next prime is 25365629. The reversal of 25365621 is 12656352.

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 not a de Polignac number, because 25365621 - 2⁷ = 25365493 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 (25365629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4227601 + ... + 4227606.

It is an arithmetic number, because the mean of its divisors is an integer number (8455208).

Almost surely, 2^25365621 is an apocalyptic number.

It is an amenable number.

25365621 is a deficient number, since it is larger than the sum of its proper divisors (8455211).

25365621 is an equidigital number, since it uses as much as digits as its factorization.

25365621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8455210.

The product of its digits is 10800, while the sum is 30.

The square root of 25365621 is about 5036.4293899548. The cubic root of 25365621 is about 293.8203238301.

The spelling of 25365621 in words is "twenty-five million, three hundred sixty-five thousand, six hundred twenty-one".