221122222 has 8 divisors (see below), whose sum is σ = 332476200. Its totient is φ = 110296824.

The previous prime is 221122193. The next prime is 221122259. The reversal of 221122222 is 222221122.

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

It is a nude number because it is divisible by every one of its digits.

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 221122196 and 221122205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131097 + ... + 132772.

It is an arithmetic number, because the mean of its divisors is an integer number (41559525).

Almost surely, 2^221122222 is an apocalyptic number.

221122222 is a deficient number, since it is larger than the sum of its proper divisors (111353978).

221122222 is a wasteful number, since it uses less digits than its factorization.

221122222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264290.

The product of its digits is 128, while the sum is 16.

The square root of 221122222 is about 14870.1789498311. The cubic root of 221122222 is about 604.7057941619.

Adding to 221122222 its reverse (222221122), we get a palindrome (443343344).

The spelling of 221122222 in words is "two hundred twenty-one million, one hundred twenty-two thousand, two hundred twenty-two".