12647377921 has 2 divisors, whose sum is σ = 12647377922. Its totient is φ = 12647377920.

The previous prime is 12647377849. The next prime is 12647377927. The reversal of 12647377921 is 12977374621.

12647377921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11815690000 + 831687921 = 108700^2 + 28839^2 .

It is a cyclic number.

It is not a de Polignac number, because 12647377921 - 2¹³ = 12647369729 is a prime.

It is not a weakly prime, because it can be changed into another prime (12647377927) by changing a digit.

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 as a sum of consecutive naturals, namely, 6323688960 + 6323688961.

It is an arithmetic number, because the mean of its divisors is an integer number (6323688961).

Almost surely, 2^12647377921 is an apocalyptic number.

It is an amenable number.

12647377921 is a deficient number, since it is larger than the sum of its proper divisors (1).

12647377921 is an equidigital number, since it uses as much as digits as its factorization.

12647377921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 889056, while the sum is 49.

The spelling of 12647377921 in words is "twelve billion, six hundred forty-seven million, three hundred seventy-seven thousand, nine hundred twenty-one".