25221944 has 16 divisors (see below), whose sum is σ = 51590520. Its totient is φ = 11464480.

The previous prime is 25221943. The next prime is 25221947. The reversal of 25221944 is 44912252.

It is a super-2 number, since 2×25221944² = 1272292918278272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25221943) 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, 143219 + ... + 143394.

Almost surely, 2^25221944 is an apocalyptic number.

It is an amenable number.

25221944 is an abundant number, since it is smaller than the sum of its proper divisors (26368576).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25221944 is a wasteful number, since it uses less digits than its factorization.

25221944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286630 (or 286626 counting only the distinct ones).

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

The square root of 25221944 is about 5022.1453583105. The cubic root of 25221944 is about 293.2645166850.

The spelling of 25221944 in words is "twenty-five million, two hundred twenty-one thousand, nine hundred forty-four".