218211222 has 8 divisors (see below), whose sum is σ = 436422456. Its totient is φ = 72737072.

The previous prime is 218211221. The next prime is 218211239. The reversal of 218211222 is 222112812.

It is a sphenic number, since it is the product of 3 distinct primes.

218211222 is an admirable number.

It is a super-2 number, since 2×218211222² = 95232274813466568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218211221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18184263 + ... + 18184274.

It is an arithmetic number, because the mean of its divisors is an integer number (54552807).

Almost surely, 2^218211222 is an apocalyptic number.

218211222 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

218211222 is a wasteful number, since it uses less digits than its factorization.

218211222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36368542.

The product of its digits is 256, while the sum is 21.

The square root of 218211222 is about 14771.9742079385. The cubic root of 218211222 is about 602.0404806427.

The spelling of 218211222 in words is "two hundred eighteen million, two hundred eleven thousand, two hundred twenty-two".