22115 has 4 divisors (see below), whose sum is σ = 26544. Its totient is φ = 17688.

The previous prime is 22111. The next prime is 22123. The reversal of 22115 is 51122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51122 = 2 ⋅25561.

It is a cyclic number.

It is not a de Polignac number, because 22115 - 2² = 22111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22096 and 22105.

It is not an unprimeable number, because it can be changed into a prime (22111) 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, 2207 + ... + 2216.

It is an arithmetic number, because the mean of its divisors is an integer number (6636).

2²²¹¹⁵ is an apocalyptic number.

22115 is a deficient number, since it is larger than the sum of its proper divisors (4429).

22115 is an equidigital number, since it uses as much as digits as its factorization.

22115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4428.

The product of its digits is 20, while the sum is 11.

The square root of 22115 is about 148.7111293750. The cubic root of 22115 is about 28.0691318942.

Adding to 22115 its reverse (51122), we get a palindrome (73237).

The spelling of 22115 in words is "twenty-two thousand, one hundred fifteen".