218118212 has 12 divisors (see below), whose sum is σ = 411069036. Its totient is φ = 100669920.

The previous prime is 218118169. The next prime is 218118311. The reversal of 218118212 is 212811812.

It can be written as a sum of positive squares in 2 ways, for example, as 133772356 + 84345856 = 11566^2 + 9184^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2097239 + ... + 2097342.

It is an arithmetic number, because the mean of its divisors is an integer number (34255753).

Almost surely, 2^218118212 is an apocalyptic number.

It is an amenable number.

218118212 is a deficient number, since it is larger than the sum of its proper divisors (192950824).

218118212 is a wasteful number, since it uses less digits than its factorization.

218118212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4194598 (or 4194596 counting only the distinct ones).

The product of its digits is 512, while the sum is 26.

The square root of 218118212 is about 14768.8256811434. The cubic root of 218118212 is about 601.9549308982.

The spelling of 218118212 in words is "two hundred eighteen million, one hundred eighteen thousand, two hundred twelve".