22218271 has 2 divisors, whose sum is σ = 22218272. Its totient is φ = 22218270.

The previous prime is 22218257. The next prime is 22218281. The reversal of 22218271 is 17281222.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22218271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22218211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11109135 + 11109136.

It is an arithmetic number, because the mean of its divisors is an integer number (11109136).

Almost surely, 2^22218271 is an apocalyptic number.

22218271 is a deficient number, since it is larger than the sum of its proper divisors (1).

22218271 is an equidigital number, since it uses as much as digits as its factorization.

22218271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 896, while the sum is 25.

The square root of 22218271 is about 4713.6260988755. The cubic root of 22218271 is about 281.1275578301.

Adding to 22218271 its reverse (17281222), we get a palindrome (39499493).

The spelling of 22218271 in words is "twenty-two million, two hundred eighteen thousand, two hundred seventy-one".