11911912012 has 96 divisors (see below), whose sum is σ = 28304156160. Its totient is φ = 4235742720.

The previous prime is 11911912009. The next prime is 11911912091. The reversal of 11911912012 is 21021911911.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 339643 + ... + 373069.

It is an arithmetic number, because the mean of its divisors is an integer number (294834960).

Almost surely, 2^11911912012 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11911912012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14152078080).

11911912012 is an abundant number, since it is smaller than the sum of its proper divisors (16392244148).

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

11911912012 is a wasteful number, since it uses less digits than its factorization.

11911912012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33551 (or 33549 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 28.

It can be divided in two parts, 119119 and 12012, that added together give a palindrome (131131).

The spelling of 11911912012 in words is "eleven billion, nine hundred eleven million, nine hundred twelve thousand, twelve".