12756830921 has 2 divisors, whose sum is σ = 12756830922. Its totient is φ = 12756830920.

The previous prime is 12756830899. The next prime is 12756830963. The reversal of 12756830921 is 12903865721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6849217600 + 5907613321 = 82760^2 + 76861^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12756830921 is a prime.

It is not a weakly prime, because it can be changed into another prime (12756830621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6378415460 + 6378415461.

It is an arithmetic number, because the mean of its divisors is an integer number (6378415461).

Almost surely, 2^12756830921 is an apocalyptic number.

It is an amenable number.

12756830921 is a deficient number, since it is larger than the sum of its proper divisors (1).

12756830921 is an equidigital number, since it uses as much as digits as its factorization.

12756830921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 44.

The spelling of 12756830921 in words is "twelve billion, seven hundred fifty-six million, eight hundred thirty thousand, nine hundred twenty-one".