11111221112 has 16 divisors (see below), whose sum is σ = 21126970800. Its totient is φ = 5477362240.

The previous prime is 11111221103. The next prime is 11111221123. The reversal of 11111221112 is 21112211111.

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 3 ways as a sum of consecutive naturals, for example, 9780437 + ... + 9781572.

It is an arithmetic number, because the mean of its divisors is an integer number (1320435675).

Almost surely, 2^11111221112 is an apocalyptic number.

It is an amenable number.

11111221112 is a deficient number, since it is larger than the sum of its proper divisors (10015749688).

11111221112 is a wasteful number, since it uses less digits than its factorization.

11111221112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19562086 (or 19562082 counting only the distinct ones).

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

Adding to 11111221112 its reverse (21112211111), we get a palindrome (32223432223).

The spelling of 11111221112 in words is "eleven billion, one hundred eleven million, two hundred twenty-one thousand, one hundred twelve".