111222211111 has 16 divisors (see below), whose sum is σ = 126760010400. Its totient is φ = 96657904000.

The previous prime is 111222211063. The next prime is 111222211141. The reversal of 111222211111 is 111112222111.

It is a cyclic number.

It is not a de Polignac number, because 111222211111 - 2²⁵ = 111188656679 is a prime.

It is a Duffinian number.

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 (111222211141) 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, 1693816 + ... + 1758253.

It is an arithmetic number, because the mean of its divisors is an integer number (7922500650).

Almost surely, 2^111222211111 is an apocalyptic number.

111222211111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

111222211111 is a deficient number, since it is larger than the sum of its proper divisors (15537799289).

111222211111 is a wasteful number, since it uses less digits than its factorization.

111222211111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3452210.

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

Adding to 111222211111 its reverse (111112222111), we get a palindrome (222334433222).

It can be divided in two parts, 1112222111 and 11, that multiplied together give a palindrome (12234443221).

The spelling of 111222211111 in words is "one hundred eleven billion, two hundred twenty-two million, two hundred eleven thousand, one hundred eleven".