221100222 has 16 divisors (see below), whose sum is σ = 505372032. Its totient is φ = 63171480.

The previous prime is 221100203. The next prime is 221100227. The reversal of 221100222 is 222001122.

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 221100198 and 221100207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221100227) 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, 2632104 + ... + 2632187.

It is an arithmetic number, because the mean of its divisors is an integer number (31585752).

Almost surely, 2^221100222 is an apocalyptic number.

221100222 is an abundant number, since it is smaller than the sum of its proper divisors (284271810).

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

221100222 is a wasteful number, since it uses less digits than its factorization.

221100222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5264303.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 221100222 is about 14869.4391958809. The cubic root of 221100222 is about 604.6857389355.

Adding to 221100222 its reverse (222001122), we get a palindrome (443101344).

The spelling of 221100222 in words is "two hundred twenty-one million, one hundred thousand, two hundred twenty-two".