22218412 has 6 divisors (see below), whose sum is σ = 38882228. Its totient is φ = 11109204.

The previous prime is 22218409. The next prime is 22218419. The reversal of 22218412 is 21481222.

It is not an unprimeable number, because it can be changed into a prime (22218419) 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, 2777298 + ... + 2777305.

Almost surely, 2^22218412 is an apocalyptic number.

It is an amenable number.

22218412 is a deficient number, since it is larger than the sum of its proper divisors (16663816).

22218412 is a wasteful number, since it uses less digits than its factorization.

22218412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5554607 (or 5554605 counting only the distinct ones).

The product of its digits is 512, while the sum is 22.

The square root of 22218412 is about 4713.6410554899. The cubic root of 22218412 is about 281.1281525194.

Adding to 22218412 its reverse (21481222), we get a palindrome (43699634).

The spelling of 22218412 in words is "twenty-two million, two hundred eighteen thousand, four hundred twelve".