11111212112 has 80 divisors (see below), whose sum is σ = 28904733312. Its totient is φ = 3996034560.

The previous prime is 11111212109. The next prime is 11111212153. The reversal of 11111212112 is 21121211111.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 330863 + ... + 362894.

Almost surely, 2^11111212112 is an apocalyptic number.

It is an amenable number.

11111212112 is an abundant number, since it is smaller than the sum of its proper divisors (17793521200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11111212112 is a wasteful number, since it uses less digits than its factorization.

11111212112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693796 (or 693790 counting only the distinct ones).

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

Adding to 11111212112 its reverse (21121211111), we get a palindrome (32232423223).

The spelling of 11111212112 in words is "eleven billion, one hundred eleven million, two hundred twelve thousand, one hundred twelve".