12729221273 has 2 divisors, whose sum is σ = 12729221274. Its totient is φ = 12729221272.

The previous prime is 12729221261. The next prime is 12729221317. The reversal of 12729221273 is 37212292721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10022412544 + 2706808729 = 100112^2 + 52027^2 .

It is a cyclic number.

It is not a de Polignac number, because 12729221273 - 2¹⁴ = 12729204889 is a prime.

It is not a weakly prime, because it can be changed into another prime (12729221203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6364610636 + 6364610637.

It is an arithmetic number, because the mean of its divisors is an integer number (6364610637).

Almost surely, 2^12729221273 is an apocalyptic number.

It is an amenable number.

12729221273 is a deficient number, since it is larger than the sum of its proper divisors (1).

12729221273 is an equidigital number, since it uses as much as digits as its factorization.

12729221273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 38.

The spelling of 12729221273 in words is "twelve billion, seven hundred twenty-nine million, two hundred twenty-one thousand, two hundred seventy-three".