25442921 has 8 divisors (see below), whose sum is σ = 29487744. Its totient is φ = 21500640.

The previous prime is 25442891. The next prime is 25442927. The reversal of 25442921 is 12924452.

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

It is not a de Polignac number, because 25442921 - 2¹⁴ = 25426537 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (25442927) 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 7 ways as a sum of consecutive naturals, for example, 25100 + ... + 26093.

It is an arithmetic number, because the mean of its divisors is an integer number (3685968).

Almost surely, 2^25442921 is an apocalyptic number.

It is an amenable number.

25442921 is a deficient number, since it is larger than the sum of its proper divisors (4044823).

25442921 is an equidigital number, since it uses as much as digits as its factorization.

25442921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51271.

The product of its digits is 5760, while the sum is 29.

The square root of 25442921 is about 5044.0976398163. The cubic root of 25442921 is about 294.1184869568.

The spelling of 25442921 in words is "twenty-five million, four hundred forty-two thousand, nine hundred twenty-one".