22215218 has 24 divisors (see below), whose sum is σ = 36415980. Its totient is φ = 10150560.

The previous prime is 22215197. The next prime is 22215223. The reversal of 22215218 is 81251222.

It can be written as a sum of positive squares in 2 ways, for example, as 22024249 + 190969 = 4693^2 + 437^2 .

It is a junction number, because it is equal to n+sod(n) for n = 22215193 and 22215202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20408 + ... + 21468.

Almost surely, 2^22215218 is an apocalyptic number.

22215218 is a deficient number, since it is larger than the sum of its proper divisors (14200762).

22215218 is a wasteful number, since it uses less digits than its factorization.

22215218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1130 (or 1111 counting only the distinct ones).

The product of its digits is 640, while the sum is 23.

The square root of 22215218 is about 4713.3022394071. The cubic root of 22215218 is about 281.1146807143.

The spelling of 22215218 in words is "twenty-two million, two hundred fifteen thousand, two hundred eighteen".