12726462721 has 6 divisors (see below), whose sum is σ = 14804252610. Its totient is φ = 10908396576.

The previous prime is 12726462709. The next prime is 12726462733.

12726462721 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (12726462709) and next prime (12726462733).

It can be written as a sum of positive squares in only one way, i.e., 8976615025 + 3749847696 = 94745^2 + 61236^2 .

It is not a de Polignac number, because 12726462721 - 2¹³ = 12726454529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12726462121) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 129861816 + ... + 129861913.

It is an arithmetic number, because the mean of its divisors is an integer number (2467375435).

Almost surely, 2^12726462721 is an apocalyptic number.

It is an amenable number.

12726462721 is a deficient number, since it is larger than the sum of its proper divisors (2077789889).

12726462721 is an equidigital number, since it uses as much as digits as its factorization.

12726462721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259723743 (or 259723736 counting only the distinct ones).

The product of its digits is 112896, while the sum is 40.

The spelling of 12726462721 in words is "twelve billion, seven hundred twenty-six million, four hundred sixty-two thousand, seven hundred twenty-one".