22218123 has 4 divisors (see below), whose sum is σ = 29624168. Its totient is φ = 14812080.

The previous prime is 22218121. The next prime is 22218127. The reversal of 22218123 is 32181222.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 22218123 - 2¹ = 22218121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22218123.

It is not an unprimeable number, because it can be changed into a prime (22218121) 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 in 3 ways as a sum of consecutive naturals, for example, 3703018 + ... + 3703023.

It is an arithmetic number, because the mean of its divisors is an integer number (7406042).

Almost surely, 2^22218123 is an apocalyptic number.

22218123 is a deficient number, since it is larger than the sum of its proper divisors (7406045).

22218123 is an equidigital number, since it uses as much as digits as its factorization.

22218123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7406044.

The product of its digits is 384, while the sum is 21.

The square root of 22218123 is about 4713.6103996830. The cubic root of 22218123 is about 281.1269336146.

Adding to 22218123 its reverse (32181222), we get a palindrome (54399345).

The spelling of 22218123 in words is "twenty-two million, two hundred eighteen thousand, one hundred twenty-three".