12721749619 has 2 divisors, whose sum is σ = 12721749620. Its totient is φ = 12721749618.

The previous prime is 12721749577. The next prime is 12721749637. The reversal of 12721749619 is 91694712721.

It is a strong prime.

It is an emirp because it is prime and its reverse (91694712721) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12721749619 is a prime.

It is a super-2 number, since 2×12721749619² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12721749119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6360874809 + 6360874810.

It is an arithmetic number, because the mean of its divisors is an integer number (6360874810).

Almost surely, 2^12721749619 is an apocalyptic number.

12721749619 is a deficient number, since it is larger than the sum of its proper divisors (1).

12721749619 is an equidigital number, since it uses as much as digits as its factorization.

12721749619 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 381024, while the sum is 49.

The spelling of 12721749619 in words is "twelve billion, seven hundred twenty-one million, seven hundred forty-nine thousand, six hundred nineteen".