12886398721 has 12 divisors (see below), whose sum is σ = 15028858260. Its totient is φ = 11017073760.

The previous prime is 12886398677. The next prime is 12886398727. The reversal of 12886398721 is 12789368821.

It can be written as a sum of positive squares in 2 ways, for example, as 3210922225 + 9675476496 = 56665^2 + 98364^2 .

It is not a de Polignac number, because 12886398721 - 2¹¹ = 12886396673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12886398727) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 318970 + ... + 357091.

It is an arithmetic number, because the mean of its divisors is an integer number (1252404855).

Almost surely, 2^12886398721 is an apocalyptic number.

It is an amenable number.

12886398721 is a deficient number, since it is larger than the sum of its proper divisors (2142459539).

12886398721 is an equidigital number, since it uses as much as digits as its factorization.

12886398721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 676464 (or 676457 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 55.

The spelling of 12886398721 in words is "twelve billion, eight hundred eighty-six million, three hundred ninety-eight thousand, seven hundred twenty-one".