218620211 has 2 divisors, whose sum is σ = 218620212. Its totient is φ = 218620210.

The previous prime is 218620189. The next prime is 218620229. The reversal of 218620211 is 112026812.

218620211 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218620211 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (218620261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109310105 + 109310106.

It is an arithmetic number, because the mean of its divisors is an integer number (109310106).

Almost surely, 2^218620211 is an apocalyptic number.

218620211 is a deficient number, since it is larger than the sum of its proper divisors (1).

218620211 is an equidigital number, since it uses as much as digits as its factorization.

218620211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 218620211 is about 14785.8111377090. The cubic root of 218620211 is about 602.4163767713.

The spelling of 218620211 in words is "two hundred eighteen million, six hundred twenty thousand, two hundred eleven".