22228109 has 4 divisors (see below), whose sum is σ = 22770300. Its totient is φ = 21685920.

The previous prime is 22228099. The next prime is 22228111. The reversal of 22228109 is 90182222.

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 5866084 + 16362025 = 2422^2 + 4045^2 .

It is a cyclic number.

It is not a de Polignac number, because 22228109 - 2⁴ = 22228093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22228139) 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, 271034 + ... + 271115.

It is an arithmetic number, because the mean of its divisors is an integer number (5692575).

Almost surely, 2^22228109 is an apocalyptic number.

It is an amenable number.

22228109 is a deficient number, since it is larger than the sum of its proper divisors (542191).

22228109 is an equidigital number, since it uses as much as digits as its factorization.

22228109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542190.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 22228109 is about 4714.6695536379. The cubic root of 22228109 is about 281.1690450788.

The spelling of 22228109 in words is "twenty-two million, two hundred twenty-eight thousand, one hundred nine".