211818213 has 16 divisors (see below), whose sum is σ = 330321600. Its totient is φ = 133779600.

The previous prime is 211818199. The next prime is 211818227. The reversal of 211818213 is 312818112.

It is an interprime number because it is at equal distance from previous prime (211818199) and next prime (211818227).

It is not a de Polignac number, because 211818213 - 2⁶ = 211818149 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211818253) 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, 205938 + ... + 206963.

It is an arithmetic number, because the mean of its divisors is an integer number (20645100).

Almost surely, 2^211818213 is an apocalyptic number.

It is an amenable number.

211818213 is a deficient number, since it is larger than the sum of its proper divisors (118503387).

211818213 is a wasteful number, since it uses less digits than its factorization.

211818213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412929 (or 412923 counting only the distinct ones).

The product of its digits is 768, while the sum is 27.

The square root of 211818213 is about 14553.9758485439. The cubic root of 211818213 is about 596.1027150943.

The spelling of 211818213 in words is "two hundred eleven million, eight hundred eighteen thousand, two hundred thirteen".