22418213 has 2 divisors, whose sum is σ = 22418214. Its totient is φ = 22418212.

The previous prime is 22418203. The next prime is 22418219. The reversal of 22418213 is 31281422.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13786369 + 8631844 = 3713^2 + 2938^2 .

It is a cyclic number.

It is not a de Polignac number, because 22418213 - 2¹⁰ = 22417189 is a prime.

It is a super-2 number, since 2×22418213² = 1005152548226738, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22418219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11209106 + 11209107.

It is an arithmetic number, because the mean of its divisors is an integer number (11209107).

Almost surely, 2^22418213 is an apocalyptic number.

It is an amenable number.

22418213 is a deficient number, since it is larger than the sum of its proper divisors (1).

22418213 is an equidigital number, since it uses as much as digits as its factorization.

22418213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 768, while the sum is 23.

The square root of 22418213 is about 4734.7875348319. The cubic root of 22418213 is about 281.9683288544.

Adding to 22418213 its reverse (31281422), we get a palindrome (53699635).

The spelling of 22418213 in words is "twenty-two million, four hundred eighteen thousand, two hundred thirteen".