12011999984 has 80 divisors (see below), whose sum is σ = 24385626720. Its totient is φ = 5724794880.

The previous prime is 12011999983. The next prime is 12012000031. The reversal of 12011999984 is 48999911021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011999983) 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, 14810939 + ... + 14811749.

It is an arithmetic number, because the mean of its divisors is an integer number (304820334).

Almost surely, 2^12011999984 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 12011999984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12192813360).

12011999984 is an abundant number, since it is smaller than the sum of its proper divisors (12373626736).

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

12011999984 is a wasteful number, since it uses less digits than its factorization.

12011999984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1218 (or 1212 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 53.

The spelling of 12011999984 in words is "twelve billion, eleven million, nine hundred ninety-nine thousand, nine hundred eighty-four".