12721807917 has 192 divisors, whose sum is σ = 24460800000. Its totient is φ = 6563519424.

The previous prime is 12721807873. The next prime is 12721807919. The reversal of 12721807917 is 71970812721.

It is not a de Polignac number, because 12721807917 - 2⁶ = 12721807853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12721807919) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 63928584 + ... + 63928782.

It is an arithmetic number, because the mean of its divisors is an integer number (127400000).

Almost surely, 2^12721807917 is an apocalyptic number.

It is an amenable number.

12721807917 is a deficient number, since it is larger than the sum of its proper divisors (11738992083).

12721807917 is an equidigital number, since it uses as much as digits as its factorization.

12721807917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307 (or 281 counting only the distinct ones).

The product of its (nonzero) digits is 98784, while the sum is 45.

The spelling of 12721807917 in words is "twelve billion, seven hundred twenty-one million, eight hundred seven thousand, nine hundred seventeen".