25221109 has 8 divisors (see below), whose sum is σ = 25904088. Its totient is φ = 24541440.

The previous prime is 25221103. The next prime is 25221137. The reversal of 25221109 is 90112252.

It can be written as a sum of positive squares in 4 ways, for example, as 625 + 25220484 = 25^2 + 5022^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 25221109 - 2⁹ = 25220597 is a prime.

It is a super-2 number, since 2×25221109² = 1272208678379762, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25221109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25221103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24799 + ... + 25795.

It is an arithmetic number, because the mean of its divisors is an integer number (3238011).

Almost surely, 2^25221109 is an apocalyptic number.

It is an amenable number.

25221109 is a deficient number, since it is larger than the sum of its proper divisors (682979).

25221109 is an equidigital number, since it uses as much as digits as its factorization.

25221109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1655.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 25221109 is about 5022.0622258192. The cubic root of 25221109 is about 293.2612803686.

The spelling of 25221109 in words is "twenty-five million, two hundred twenty-one thousand, one hundred nine".