12731284716721 has 4 divisors (see below), whose sum is σ = 12746459073600. Its totient is φ = 12716110359844.

The previous prime is 12731284716611. The next prime is 12731284716803. The reversal of 12731284716721 is 12761748213721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12731284716721 - 2⁹ = 12731284716209 is a prime.

It is a super-2 number, since 2×12731284716721² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12731284746721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7587177181 + ... + 7587178858.

It is an arithmetic number, because the mean of its divisors is an integer number (3186614768400).

Almost surely, 2^{12731284716721} is an apocalyptic number.

It is an amenable number.

12731284716721 is a deficient number, since it is larger than the sum of its proper divisors (15174356879).

12731284716721 is an equidigital number, since it uses as much as digits as its factorization.

12731284716721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15174356878.

The product of its digits is 1580544, while the sum is 52.

The spelling of 12731284716721 in words is "twelve trillion, seven hundred thirty-one billion, two hundred eighty-four million, seven hundred sixteen thousand, seven hundred twenty-one".