22218223 has 2 divisors, whose sum is σ = 22218224. Its totient is φ = 22218222.

The previous prime is 22218211. The next prime is 22218257. The reversal of 22218223 is 32281222.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22218223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22218194 and 22218203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22215223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11109111 + 11109112.

It is an arithmetic number, because the mean of its divisors is an integer number (11109112).

Almost surely, 2^22218223 is an apocalyptic number.

22218223 is a deficient number, since it is larger than the sum of its proper divisors (1).

22218223 is an equidigital number, since it uses as much as digits as its factorization.

22218223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 768, while the sum is 22.

The square root of 22218223 is about 4713.6210072512. The cubic root of 22218223 is about 281.1273553821.

Adding to 22218223 its reverse (32281222), we get a palindrome (54499445).

The spelling of 22218223 in words is "twenty-two million, two hundred eighteen thousand, two hundred twenty-three".