111111311211 has 16 divisors (see below), whose sum is σ = 158625540000. Its totient is φ = 68933562368.

The previous prime is 111111311191. The next prime is 111111311329. The reversal of 111111311211 is 112113111111.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 111111311211 - 2¹¹ = 111111309163 is a prime.

It is not an unprimeable number, because it can be changed into a prime (111111411211) 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, 12235086 + ... + 12244163.

It is an arithmetic number, because the mean of its divisors is an integer number (9914096250).

Almost surely, 2^111111311211 is an apocalyptic number.

111111311211 is a deficient number, since it is larger than the sum of its proper divisors (47514228789).

111111311211 is a wasteful number, since it uses less digits than its factorization.

111111311211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24479358.

The product of its digits is 6, while the sum is 15.

Adding to 111111311211 its reverse (112113111111), we get a palindrome (223224422322).

The spelling of 111111311211 in words is "one hundred eleven billion, one hundred eleven million, three hundred eleven thousand, two hundred eleven".