12021999966 has 64 divisors (see below), whose sum is σ = 27463767360. Its totient is φ = 3895309440.

The previous prime is 12021999943. The next prime is 12022000021. The reversal of 12021999966 is 66999912021.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

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, 2757060 + ... + 2761416.

It is an arithmetic number, because the mean of its divisors is an integer number (429121365).

Almost surely, 2^12021999966 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12021999966, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13731883680).

12021999966 is an abundant number, since it is smaller than the sum of its proper divisors (15441767394).

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

12021999966 is a wasteful number, since it uses less digits than its factorization.

12021999966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5786 (or 5780 counting only the distinct ones).

The product of its (nonzero) digits is 944784, while the sum is 54.

The spelling of 12021999966 in words is "twelve billion, twenty-one million, nine hundred ninety-nine thousand, nine hundred sixty-six".