12021721740 has 216 divisors, whose sum is σ = 42533814960. Its totient is φ = 2740421376.

The previous prime is 12021721739. The next prime is 12021721793. The reversal of 12021721740 is 4712712021.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3693954 + ... + 3697206.

It is an arithmetic number, because the mean of its divisors is an integer number (196915810).

Almost surely, 2^12021721740 is an apocalyptic number.

12021721740 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 12021721740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21266907480).

12021721740 is an abundant number, since it is smaller than the sum of its proper divisors (30512093220).

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

12021721740 is a wasteful number, since it uses less digits than its factorization.

12021721740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3701 (or 3689 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The spelling of 12021721740 in words is "twelve billion, twenty-one million, seven hundred twenty-one thousand, seven hundred forty".