12111990912 has 384 divisors, whose sum is σ = 42144523200. Its totient is φ = 3456649728.

The previous prime is 12111990907. The next prime is 12111990949. The reversal of 12111990912 is 21909911121.

It is a tau number, because it is divible by the number of its divisors (384).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13716423 + ... + 13717305.

Almost surely, 2^12111990912 is an apocalyptic number.

12111990912 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 12111990912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21072261600).

12111990912 is an abundant number, since it is smaller than the sum of its proper divisors (30032532288).

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

12111990912 is an frugal number, since it uses more digits than its factorization.

12111990912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 932 (or 895 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 36.

The spelling of 12111990912 in words is "twelve billion, one hundred eleven million, nine hundred ninety thousand, nine hundred twelve".