111222211211 has 4 divisors (see below), whose sum is σ = 113320743552. Its totient is φ = 109123678872.

The previous prime is 111222211171. The next prime is 111222211241. The reversal of 111222211211 is 112112222111.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 111222211211 - 2⁶ = 111222211147 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 111222211211.

It is not an unprimeable number, because it can be changed into a prime (111222211241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1049266091 + ... + 1049266196.

It is an arithmetic number, because the mean of its divisors is an integer number (28330185888).

Almost surely, 2^111222211211 is an apocalyptic number.

111222211211 is a deficient number, since it is larger than the sum of its proper divisors (2098532341).

111222211211 is an equidigital number, since it uses as much as digits as its factorization.

111222211211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2098532340.

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

Adding to 111222211211 its reverse (112112222111), we get a palindrome (223334433322).

The spelling of 111222211211 in words is "one hundred eleven billion, two hundred twenty-two million, two hundred eleven thousand, two hundred eleven".