25221138 has 8 divisors (see below), whose sum is σ = 50442288. Its totient is φ = 8407044.

The previous prime is 25221137. The next prime is 25221173. The reversal of 25221138 is 83112252.

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

25221138 is an admirable number.

It is a super-2 number, since 2×25221138² = 1272211604030088, which contains 22 as substring.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25221137) 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, 2101756 + ... + 2101767.

It is an arithmetic number, because the mean of its divisors is an integer number (6305286).

Almost surely, 2^25221138 is an apocalyptic number.

25221138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

25221138 is a wasteful number, since it uses less digits than its factorization.

25221138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4203528.

The product of its digits is 960, while the sum is 24.

The square root of 25221138 is about 5022.0651130785. The cubic root of 25221138 is about 293.2613927688.

The spelling of 25221138 in words is "twenty-five million, two hundred twenty-one thousand, one hundred thirty-eight".