221111222 has 8 divisors (see below), whose sum is σ = 333385896. Its totient is φ = 109982592.

The previous prime is 221111183. The next prime is 221111249. The reversal of 221111222 is 222111122.

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 = 221111197 and 221111206.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 286028 + ... + 286799.

It is an arithmetic number, because the mean of its divisors is an integer number (41673237).

Almost surely, 2^221111222 is an apocalyptic number.

221111222 is a deficient number, since it is larger than the sum of its proper divisors (112274674).

221111222 is a wasteful number, since it uses less digits than its factorization.

221111222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 573022.

The product of its digits is 32, while the sum is 14.

The square root of 221111222 is about 14869.8090774562. The cubic root of 221111222 is about 604.6957667150.

Adding to 221111222 its reverse (222111122), we get a palindrome (443222344).

It can be divided in two parts, 22111122 and 2, that multiplied together give a palindrome (44222244).

The spelling of 221111222 in words is "two hundred twenty-one million, one hundred eleven thousand, two hundred twenty-two".