11121222111 has 16 divisors (see below), whose sum is σ = 14900371200. Its totient is φ = 7378147520.

The previous prime is 11121222107. The next prime is 11121222173. The reversal of 11121222111 is 11122212111.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 11121222111 - 2² = 11121222107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11121223111) 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, 1681990 + ... + 1688588.

It is an arithmetic number, because the mean of its divisors is an integer number (931273200).

Almost surely, 2^11121222111 is an apocalyptic number.

11121222111 is a deficient number, since it is larger than the sum of its proper divisors (3779149089).

11121222111 is a wasteful number, since it uses less digits than its factorization.

11121222111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9246.

The product of its digits is 16, while the sum is 15.

Adding to 11121222111 its reverse (11122212111), we get a palindrome (22243434222).

The spelling of 11121222111 in words is "eleven billion, one hundred twenty-one million, two hundred twenty-two thousand, one hundred eleven".