11131111212 has 96 divisors (see below), whose sum is σ = 28217978880. Its totient is φ = 3394794240.

The previous prime is 11131111207. The next prime is 11131111249. The reversal of 11131111212 is 21211113111.

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 junction number, because it is equal to n+sod(n) for n = 11131111191 and 11131111200.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13524633 + ... + 13525455.

It is an arithmetic number, because the mean of its divisors is an integer number (293937280).

Almost surely, 2^11131111212 is an apocalyptic number.

11131111212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11131111212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14108989440).

11131111212 is an abundant number, since it is smaller than the sum of its proper divisors (17086867668).

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

11131111212 is a wasteful number, since it uses less digits than its factorization.

11131111212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1503 (or 1501 counting only the distinct ones).

The product of its digits is 12, while the sum is 15.

Adding to 11131111212 its reverse (21211113111), we get a palindrome (32342224323).

The spelling of 11131111212 in words is "eleven billion, one hundred thirty-one million, one hundred eleven thousand, two hundred twelve".