218221122 has 16 divisors (see below), whose sum is σ = 498791232. Its totient is φ = 62348880.

The previous prime is 218221111. The next prime is 218221187. The reversal of 218221122 is 221122812.

218221122 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2597829 + ... + 2597912.

It is an arithmetic number, because the mean of its divisors is an integer number (31174452).

Almost surely, 2^218221122 is an apocalyptic number.

218221122 is an abundant number, since it is smaller than the sum of its proper divisors (280570110).

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

218221122 is a wasteful number, since it uses less digits than its factorization.

218221122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5195753.

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

The square root of 218221122 is about 14772.3092981429. The cubic root of 218221122 is about 602.0495851402.

Adding to 218221122 its reverse (221122812), we get a palindrome (439343934).

The spelling of 218221122 in words is "two hundred eighteen million, two hundred twenty-one thousand, one hundred twenty-two".