25442321 has 4 divisors (see below), whose sum is σ = 25604532. Its totient is φ = 25280112.

The previous prime is 25442303. The next prime is 25442323. The reversal of 25442321 is 12324452.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11833600 + 13608721 = 3440^2 + 3689^2 .

It is a cyclic number.

It is not a de Polignac number, because 25442321 - 2¹⁴ = 25425937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25442323) 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, 80870 + ... + 81183.

It is an arithmetic number, because the mean of its divisors is an integer number (6401133).

Almost surely, 2^25442321 is an apocalyptic number.

It is an amenable number.

25442321 is a deficient number, since it is larger than the sum of its proper divisors (162211).

25442321 is a wasteful number, since it uses less digits than its factorization.

25442321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162210.

The product of its digits is 1920, while the sum is 23.

The square root of 25442321 is about 5044.0381640111. The cubic root of 25442321 is about 294.1161749518.

Adding to 25442321 its reverse (12324452), we get a palindrome (37766773).

The spelling of 25442321 in words is "twenty-five million, four hundred forty-two thousand, three hundred twenty-one".