11111131212 has 48 divisors (see below), whose sum is σ = 26371978752. Its totient is φ = 3640092480.

The previous prime is 11111131211. The next prime is 11111131223. The reversal of 11111131212 is 21213111111.

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 = 11111131191 and 11111131200.

It is not an unprimeable number, because it can be changed into a prime (11111131211) 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, 1036303 + ... + 1046969.

It is an arithmetic number, because the mean of its divisors is an integer number (549416224).

Almost surely, 2^11111131212 is an apocalyptic number.

11111131212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

11111131212 is an abundant number, since it is smaller than the sum of its proper divisors (15260847540).

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

11111131212 is a wasteful number, since it uses less digits than its factorization.

11111131212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12158 (or 12156 counting only the distinct ones).

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

Adding to 11111131212 its reverse (21213111111), we get a palindrome (32324242323).

The spelling of 11111131212 in words is "eleven billion, one hundred eleven million, one hundred thirty-one thousand, two hundred twelve".