22291 has 2 divisors, whose sum is σ = 22292. Its totient is φ = 22290.

The previous prime is 22283. The next prime is 22303. The reversal of 22291 is 19222.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22291 - 2³ = 22283 is a prime.

It is not a weakly prime, because it can be changed into another prime (22271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11145 + 11146.

It is an arithmetic number, because the mean of its divisors is an integer number (11146).

2²²²⁹¹ is an apocalyptic number.

22291 is a deficient number, since it is larger than the sum of its proper divisors (1).

22291 is an equidigital number, since it uses as much as digits as its factorization.

22291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72, while the sum is 16.

The square root of 22291 is about 149.3017079608. The cubic root of 22291 is about 28.1433970171.

It can be divided in two parts, 222 and 91, that multiplied together give a palindrome (20202).

The spelling of 22291 in words is "twenty-two thousand, two hundred ninety-one".