25221344 has 12 divisors (see below), whose sum is σ = 49654584. Its totient is φ = 12610656.

The previous prime is 25221337. The next prime is 25221347. The reversal of 25221344 is 44312252.

It is a happy number.

It is a super-2 number, since 2×25221344² = 1272232386332672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25221347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 394052 + ... + 394115.

It is an arithmetic number, because the mean of its divisors is an integer number (4137882).

Almost surely, 2^25221344 is an apocalyptic number.

It is an amenable number.

25221344 is a deficient number, since it is larger than the sum of its proper divisors (24433240).

25221344 is an equidigital number, since it uses as much as digits as its factorization.

25221344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 788177 (or 788169 counting only the distinct ones).

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

The square root of 25221344 is about 5022.0856225278. The cubic root of 25221344 is about 293.2621911954.

Adding to 25221344 its reverse (44312252), we get a palindrome (69533596).

The spelling of 25221344 in words is "twenty-five million, two hundred twenty-one thousand, three hundred forty-four".