22211218 has 4 divisors (see below), whose sum is σ = 33316830. Its totient is φ = 11105608.

The previous prime is 22211201. The next prime is 22211219. The reversal of 22211218 is 81211222.

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

It can be written as a sum of positive squares in only one way, i.e., 16999129 + 5212089 = 4123^2 + 2283^2 .

It is a junction number, because it is equal to n+sod(n) for n = 22211195 and 22211204.

It is not an unprimeable number, because it can be changed into a prime (22211219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5552803 + ... + 5552806.

Almost surely, 2^22211218 is an apocalyptic number.

22211218 is a deficient number, since it is larger than the sum of its proper divisors (11105612).

22211218 is a wasteful number, since it uses less digits than its factorization.

22211218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11105611.

The product of its digits is 128, while the sum is 19.

The square root of 22211218 is about 4712.8778893581. The cubic root of 22211218 is about 281.0978075027.

The spelling of 22211218 in words is "twenty-two million, two hundred eleven thousand, two hundred eighteen".