12721807919 has 2 divisors, whose sum is σ = 12721807920. Its totient is φ = 12721807918.

The previous prime is 12721807873. The next prime is 12721807991. The reversal of 12721807919 is 91970812721.

Together with next prime (12721807991) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12721807919 is a prime.

It is a super-2 number, since 2×12721807919² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12721806919) 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, 6360903959 + 6360903960.

It is an arithmetic number, because the mean of its divisors is an integer number (6360903960).

Almost surely, 2^12721807919 is an apocalyptic number.

12721807919 is a deficient number, since it is larger than the sum of its proper divisors (1).

12721807919 is an equidigital number, since it uses as much as digits as its factorization.

12721807919 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 127008, while the sum is 47.

The spelling of 12721807919 in words is "twelve billion, seven hundred twenty-one million, eight hundred seven thousand, nine hundred nineteen".