11112221111 has 16 divisors (see below), whose sum is σ = 11396592000. Its totient is φ = 10832145408.

The previous prime is 11112221089. The next prime is 11112221119.

11112221111 is nontrivially palindromic in base 10.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11112221111 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 (11112221119) 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, 2387915 + ... + 2392563.

It is an arithmetic number, because the mean of its divisors is an integer number (712287000).

Almost surely, 2^11112221111 is an apocalyptic number.

11112221111 is a deficient number, since it is larger than the sum of its proper divisors (284370889).

11112221111 is a wasteful number, since it uses less digits than its factorization.

11112221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5098.

The product of its digits is 8, while the sum is 14.

It can be divided in two parts, 1111 and 2221111, that added together give a palindrome (2222222).

The spelling of 11112221111 in words is "eleven billion, one hundred twelve million, two hundred twenty-one thousand, one hundred eleven".