12021881640 has 128 divisors (see below), whose sum is σ = 37198656000. Its totient is φ = 3105865728.

The previous prime is 12021881639. The next prime is 12021881681. The reversal of 12021881640 is 4618812021.

12021881640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1055496 + ... + 1066824.

It is an arithmetic number, because the mean of its divisors is an integer number (290614500).

Almost surely, 2^12021881640 is an apocalyptic number.

12021881640 is a gapful number since it is divisible by the number (10) 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 12021881640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18599328000).

12021881640 is an abundant number, since it is smaller than the sum of its proper divisors (25176774360).

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

12021881640 is a wasteful number, since it uses less digits than its factorization.

12021881640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11619 (or 11615 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 33.

The spelling of 12021881640 in words is "twelve billion, twenty-one million, eight hundred eighty-one thousand, six hundred forty".