222218 has 4 divisors (see below), whose sum is σ = 333330. Its totient is φ = 111108.

The previous prime is 222199. The next prime is 222247. The reversal of 222218 is 812222.

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., 142129 + 80089 = 377^2 + 283^2 .

It is a nialpdrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 222196 and 222205.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55553 + ... + 55556.

2²²²²¹⁸ is an apocalyptic number.

222218 is a deficient number, since it is larger than the sum of its proper divisors (111112).

222218 is a wasteful number, since it uses less digits than its factorization.

222218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111111.

The product of its digits is 128, while the sum is 17.

The square root of 222218 is about 471.4000424268. The cubic root of 222218 is about 60.5703028110.

The spelling of 222218 in words is "two hundred twenty-two thousand, two hundred eighteen".