22091 has 2 divisors, whose sum is σ = 22092.
Its totient is φ = 22090.
The previous prime is 22079. The next prime is 22093. The reversal of 22091 is 19022.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 22091 - 26 = 22027 is a prime.
Together with 22093, it forms a pair of twin primes.
It is a Chen prime.
It is not a weakly prime, because it can be changed into another prime (22093) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11045 + 11046.
It is an arithmetic number, because the mean of its divisors is an integer number (11046).
222091 is an apocalyptic number.
22091 is a deficient number, since it is larger than the sum of its proper divisors (1).
22091 is an equidigital number, since it uses as much as digits as its factorization.
22091 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 36, while the sum is 14.
The square root of 22091 is about 148.6304141150.
The cubic root of 22091 is about 28.0589743389.
The spelling of 22091 in words is "twenty-two thousand, ninety-one".