22218307 has 2 divisors, whose sum is σ = 22218308. Its totient is φ = 22218306.

The previous prime is 22218281. The next prime is 22218311. The reversal of 22218307 is 70381222.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22218307 - 2⁷ = 22218179 is a prime.

It is not a weakly prime, because it can be changed into another prime (22218347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11109153 + 11109154.

It is an arithmetic number, because the mean of its divisors is an integer number (11109154).

Almost surely, 2^22218307 is an apocalyptic number.

22218307 is a deficient number, since it is larger than the sum of its proper divisors (1).

22218307 is an equidigital number, since it uses as much as digits as its factorization.

22218307 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 22218307 is about 4713.6299175901. The cubic root of 22218307 is about 281.1277096659.

Adding to 22218307 its reverse (70381222), we get a palindrome (92599529).

The spelling of 22218307 in words is "twenty-two million, two hundred eighteen thousand, three hundred seven".