12816921077388 has 240 divisors, whose sum is σ = 36747237431520. Its totient is φ = 3877368735744.

The previous prime is 12816921077377. The next prime is 12816921077447. The reversal of 12816921077388 is 88377012961821.

12816921077388 is a `hidden beast` number, since 1 + 2 + 8 + 169 + 21 + 0 + 77 + 388 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 125658106 + ... + 125760062.

It is an arithmetic number, because the mean of its divisors is an integer number (153113489298).

Almost surely, 2^{12816921077388} is an apocalyptic number.

12816921077388 is a gapful number since it is divisible by the number (18) 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 12816921077388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18373618715760).

12816921077388 is an abundant number, since it is smaller than the sum of its proper divisors (23930316354132).

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

12816921077388 is a wasteful number, since it uses less digits than its factorization.

12816921077388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102806 (or 102795 counting only the distinct ones).

The product of its (nonzero) digits is 16257024, while the sum is 63.

The spelling of 12816921077388 in words is "twelve trillion, eight hundred sixteen billion, nine hundred twenty-one million, seventy-seven thousand, three hundred eighty-eight".