12681347333821 has 4 divisors (see below), whose sum is σ = 13348786667200. Its totient is φ = 12013908000444.

The previous prime is 12681347333819. The next prime is 12681347333873. The reversal of 12681347333821 is 12833374318621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12681347333821 - 2¹ = 12681347333819 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12681347336821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 333719666661 + ... + 333719666698.

It is an arithmetic number, because the mean of its divisors is an integer number (3337196666800).

Almost surely, 2^{12681347333821} is an apocalyptic number.

It is an amenable number.

12681347333821 is a deficient number, since it is larger than the sum of its proper divisors (667439333379).

12681347333821 is an equidigital number, since it uses as much as digits as its factorization.

12681347333821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667439333378.

The product of its digits is 3483648, while the sum is 52.

The spelling of 12681347333821 in words is "twelve trillion, six hundred eighty-one billion, three hundred forty-seven million, three hundred thirty-three thousand, eight hundred twenty-one".