222111111 has 16 divisors (see below), whose sum is σ = 305277408. Its totient is φ = 143539200.

The previous prime is 222111091. The next prime is 222111133. The reversal of 222111111 is 111111222.

It is not a de Polignac number, because 222111111 - 2⁵ = 222111079 is a prime.

222111111 is a modest number, since divided by 11111 gives 2221 as remainder.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222111151) 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, 27631 + ... + 34751.

It is an arithmetic number, because the mean of its divisors is an integer number (19079838).

Almost surely, 2^222111111 is an apocalyptic number.

222111111 is a deficient number, since it is larger than the sum of its proper divisors (83166297).

222111111 is a wasteful number, since it uses less digits than its factorization.

222111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7442.

The product of its digits is 8, while the sum is 12.

The square root of 222111111 is about 14903.3926003444. The cubic root of 222111111 is about 605.6058962025.

Adding to 222111111 its reverse (111111222), we get a palindrome (333222333).

It can be divided in two parts, 222111 and 111, that added together give a palindrome (222222).

The spelling of 222111111 in words is "two hundred twenty-two million, one hundred eleven thousand, one hundred eleven".