111121111211 has 12 divisors (see below), whose sum is σ = 122526733056. Its totient is φ = 100700484720.

The previous prime is 111121111193. The next prime is 111121111243. The reversal of 111121111211 is 112111121111.

It is not a de Polignac number, because 111121111211 - 2⁶ = 111121111147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111121111291) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1410155 + ... + 1486868.

It is an arithmetic number, because the mean of its divisors is an integer number (10210561088).

Almost surely, 2^111121111211 is an apocalyptic number.

111121111211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

111121111211 is a deficient number, since it is larger than the sum of its proper divisors (11405621845).

111121111211 is a wasteful number, since it uses less digits than its factorization.

111121111211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2897362 (or 2897351 counting only the distinct ones).

The product of its digits is 4, while the sum is 14.

Adding to 111121111211 its reverse (112111121111), we get a palindrome (223232232322).

It can be divided in two parts, 11 and 1121111211, that multiplied together give a palindrome (12332223321).

The spelling of 111121111211 in words is "one hundred eleven billion, one hundred twenty-one million, one hundred eleven thousand, two hundred eleven".