211218 has 32 divisors (see below), whose sum is σ = 497664. Its totient is φ = 58512.

The previous prime is 211217. The next prime is 211219. The reversal of 211218 is 812112.

211218 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (211217) and next prime (211219).

It is a super-2 number, since 2×211218² = 89226087048, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211197 and 211206.

It is not an unprimeable number, because it can be changed into a prime (211213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1921 + ... + 2027.

It is an arithmetic number, because the mean of its divisors is an integer number (15552).

2²¹¹²¹⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211218, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (248832).

211218 is an abundant number, since it is smaller than the sum of its proper divisors (286446).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211218 is a wasteful number, since it uses less digits than its factorization.

211218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166.

The product of its digits is 32, while the sum is 15.

The square root of 211218 is about 459.5845950421. The cubic root of 211218 is about 59.5539138946.

The spelling of 211218 in words is "two hundred eleven thousand, two hundred eighteen".