12821059399668 has 192 divisors, whose sum is σ = 32668126353408. Its totient is φ = 3890197808640.

The previous prime is 12821059399609. The next prime is 12821059399703. The reversal of 12821059399668 is 86699395012821.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1840251921 + ... + 1840258887.

It is an arithmetic number, because the mean of its divisors is an integer number (170146491424).

Almost surely, 2^{12821059399668} 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 12821059399668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16334063176704).

12821059399668 is an abundant number, since it is smaller than the sum of its proper divisors (19847066953740).

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

12821059399668 is a wasteful number, since it uses less digits than its factorization.

12821059399668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7702 (or 7700 counting only the distinct ones).

The product of its (nonzero) digits is 100776960, while the sum is 69.

The spelling of 12821059399668 in words is "twelve trillion, eight hundred twenty-one billion, fifty-nine million, three hundred ninety-nine thousand, six hundred sixty-eight".