11111221121112 has 48 divisors (see below), whose sum is σ = 34391874900240. Its totient is φ = 3174634605888.

The previous prime is 11111221121101. The next prime is 11111221121219. The reversal of 11111221121112 is 21112112211111.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11023036323 + ... + 11023037330.

It is an arithmetic number, because the mean of its divisors is an integer number (716497393755).

Almost surely, 2^{11111221121112} is an apocalyptic number.

11111221121112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

11111221121112 is an abundant number, since it is smaller than the sum of its proper divisors (23280653779128).

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

11111221121112 is a wasteful number, since it uses less digits than its factorization.

11111221121112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22046073672 (or 22046073665 counting only the distinct ones).

The product of its digits is 16, while the sum is 18.

Adding to 11111221121112 its reverse (21112112211111), we get a palindrome (32223333332223).

The spelling of 11111221121112 in words is "eleven trillion, one hundred eleven billion, two hundred twenty-one million, one hundred twenty-one thousand, one hundred twelve".