12834370721 has 4 divisors (see below), whose sum is σ = 12834802452. Its totient is φ = 12833938992.

The previous prime is 12834370621. The next prime is 12834370727. The reversal of 12834370721 is 12707343821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4486990225 + 8347380496 = 66985^2 + 91364^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12834370721 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12834370727) 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, 167690 + ... + 231923.

It is an arithmetic number, because the mean of its divisors is an integer number (3208700613).

Almost surely, 2^12834370721 is an apocalyptic number.

It is an amenable number.

12834370721 is a deficient number, since it is larger than the sum of its proper divisors (431731).

12834370721 is an equidigital number, since it uses as much as digits as its factorization.

12834370721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431730.

The product of its (nonzero) digits is 56448, while the sum is 38.

The spelling of 12834370721 in words is "twelve billion, eight hundred thirty-four million, three hundred seventy thousand, seven hundred twenty-one".