22217231 has 2 divisors, whose sum is σ = 22217232. Its totient is φ = 22217230.

The previous prime is 22217189. The next prime is 22217233. The reversal of 22217231 is 13271222.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22217231 - 2¹⁴ = 22200847 is a prime.

It is a super-2 number, since 2×22217231² = 987210706614722, which contains 22 as substring.

Together with 22217233, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22217233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11108615 + 11108616.

It is an arithmetic number, because the mean of its divisors is an integer number (11108616).

Almost surely, 2^22217231 is an apocalyptic number.

22217231 is a deficient number, since it is larger than the sum of its proper divisors (1).

22217231 is an equidigital number, since it uses as much as digits as its factorization.

22217231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 336, while the sum is 20.

The square root of 22217231 is about 4713.5157791186. The cubic root of 22217231 is about 281.1231713919.

Adding to 22217231 its reverse (13271222), we get a palindrome (35488453).

The spelling of 22217231 in words is "twenty-two million, two hundred seventeen thousand, two hundred thirty-one".