12001109112 has 96 divisors (see below), whose sum is σ = 33728348160. Its totient is φ = 3850920000.

The previous prime is 12001109101. The next prime is 12001109117. The reversal of 12001109112 is 21190110021.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001109117) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 412237 + ... + 440387.

It is an arithmetic number, because the mean of its divisors is an integer number (351336960).

Almost surely, 2^12001109112 is an apocalyptic number.

12001109112 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 12001109112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16864174080).

12001109112 is an abundant number, since it is smaller than the sum of its proper divisors (21727239048).

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

12001109112 is a wasteful number, since it uses less digits than its factorization.

12001109112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28385 (or 28378 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 18.

Adding to 12001109112 its reverse (21190110021), we get a palindrome (33191219133).

The spelling of 12001109112 in words is "twelve billion, one million, one hundred nine thousand, one hundred twelve".