22105 has 4 divisors (see below), whose sum is σ = 26532. Its totient is φ = 17680.

The previous prime is 22093. The next prime is 22109. The reversal of 22105 is 50122.

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 13456 + 8649 = 116^2 + 93^2 .

It is not a de Polignac number, because 22105 - 2⁵ = 22073 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22091 and 22100.

It is not an unprimeable number, because it can be changed into a prime (22109) 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, 2206 + ... + 2215.

It is an arithmetic number, because the mean of its divisors is an integer number (6633).

2²²¹⁰⁵ is an apocalyptic number.

It is an amenable number.

22105 is a deficient number, since it is larger than the sum of its proper divisors (4427).

22105 is an equidigital number, since it uses as much as digits as its factorization.

22105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4426.

The product of its (nonzero) digits is 20, while the sum is 10.

The square root of 22105 is about 148.6775033420. The cubic root of 22105 is about 28.0649004731.

Adding to 22105 its reverse (50122), we get a palindrome (72227).

The spelling of 22105 in words is "twenty-two thousand, one hundred five".