Factorization
218 = 2 × 109
218 has 4 divisors: 1, 2, 109, 218
Sum of all divisors other than 218:
112
Sums & differences
Sum of 2 squares: 218 = 132 + 72
Goldbach conjecture: 218 = 211 + 7 = 199 + 19 = 181 + 37 = 157 + 61 = 151 + 67 = 139 + 79 = 109 + 109
