12774247721 has 4 divisors (see below), whose sum is σ = 12810850500. Its totient is φ = 12737644944.

The previous prime is 12774247693. The next prime is 12774247723.

12774247721 is nontrivially palindromic in base 10.

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 7350661696 + 5423586025 = 85736^2 + 73645^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12774247721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12774247723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18300866 + ... + 18301563.

It is an arithmetic number, because the mean of its divisors is an integer number (3202712625).

Almost surely, 2^12774247721 is an apocalyptic number.

It is an amenable number.

12774247721 is a deficient number, since it is larger than the sum of its proper divisors (36602779).

12774247721 is an equidigital number, since it uses as much as digits as its factorization.

12774247721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36602778.

The product of its digits is 307328, while the sum is 44.

The spelling of 12774247721 in words is "twelve billion, seven hundred seventy-four million, two hundred forty-seven thousand, seven hundred twenty-one".