212218 has 4 divisors (see below), whose sum is σ = 318330. Its totient is φ = 106108.

The previous prime is 212209. The next prime is 212227. The reversal of 212218 is 812212.

212218 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is an interprime number because it is at equal distance from previous prime (212209) and next prime (212227).

It can be written as a sum of positive squares in only one way, i.e., 120409 + 91809 = 347^2 + 303^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53053 + ... + 53056.

2²¹²²¹⁸ is an apocalyptic number.

212218 is a deficient number, since it is larger than the sum of its proper divisors (106112).

212218 is a wasteful number, since it uses less digits than its factorization.

212218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106111.

The product of its digits is 64, while the sum is 16.

The square root of 212218 is about 460.6712493742. The cubic root of 212218 is about 59.6477508709.

The spelling of 212218 in words is "two hundred twelve thousand, two hundred eighteen".