221222111111 has 16 divisors (see below), whose sum is σ = 239791527360. Its totient is φ = 203459182080.

The previous prime is 221222111107. The next prime is 221222111179. The reversal of 221222111111 is 111111222122.

It is a cyclic number.

It is not a de Polignac number, because 221222111111 - 2² = 221222111107 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221222111111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221222111101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 527360 + ... + 848853.

It is an arithmetic number, because the mean of its divisors is an integer number (14986970460).

Almost surely, 2^221222111111 is an apocalyptic number.

221222111111 is a deficient number, since it is larger than the sum of its proper divisors (18569416249).

221222111111 is a wasteful number, since it uses less digits than its factorization.

221222111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1376506.

The product of its digits is 32, while the sum is 17.

Adding to 221222111111 its reverse (111111222122), we get a palindrome (332333333233).

The spelling of 221222111111 in words is "two hundred twenty-one billion, two hundred twenty-two million, one hundred eleven thousand, one hundred eleven".