221210112218 has 16 divisors (see below), whose sum is σ = 346369827456. Its totient is φ = 105757056240.

The previous prime is 221210112217. The next prime is 221210112247. The reversal of 221210112218 is 812211012122.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 221210112193 and 221210112202.

It is not an unprimeable number, because it can be changed into a prime (221210112217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 762221 + ... + 1011632.

It is an arithmetic number, because the mean of its divisors is an integer number (21648114216).

Almost surely, 2^221210112218 is an apocalyptic number.

221210112218 is a deficient number, since it is larger than the sum of its proper divisors (125159715238).

221210112218 is a wasteful number, since it uses less digits than its factorization.

221210112218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1776589.

The product of its (nonzero) digits is 256, while the sum is 23.

The spelling of 221210112218 in words is "two hundred twenty-one billion, two hundred ten million, one hundred twelve thousand, two hundred eighteen".