11113231212 has 96 divisors (see below), whose sum is σ = 29422814400. Its totient is φ = 3626643456.

The previous prime is 11113231189. The next prime is 11113231229. The reversal of 11113231212 is 21213231111.

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 an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1074964 + ... + 1085252.

It is an arithmetic number, because the mean of its divisors is an integer number (306487650).

Almost surely, 2^11113231212 is an apocalyptic number.

11113231212 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 11113231212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14711407200).

11113231212 is an abundant number, since it is smaller than the sum of its proper divisors (18309583188).

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

11113231212 is a wasteful number, since it uses less digits than its factorization.

11113231212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10512 (or 10504 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

Adding to 11113231212 its reverse (21213231111), we get a palindrome (32326462323).

It can be divided in two parts, 1111 and 3231212, that added together give a palindrome (3232323).

The spelling of 11113231212 in words is "eleven billion, one hundred thirteen million, two hundred thirty-one thousand, two hundred twelve".