12408318721 has 8 divisors (see below), whose sum is σ = 12632755688. Its totient is φ = 12184560000.

The previous prime is 12408318709. The next prime is 12408318731. The reversal of 12408318721 is 12781380421.

It can be written as a sum of positive squares in 4 ways, for example, as 4178200321 + 8230118400 = 64639^2 + 90720^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12408318721 - 2¹¹ = 12408316673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12408318731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132570 + ... + 205891.

It is an arithmetic number, because the mean of its divisors is an integer number (1579094461).

Almost surely, 2^12408318721 is an apocalyptic number.

It is an amenable number.

12408318721 is a deficient number, since it is larger than the sum of its proper divisors (224436967).

12408318721 is an equidigital number, since it uses as much as digits as its factorization.

12408318721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339123.

The product of its (nonzero) digits is 21504, while the sum is 37.

The spelling of 12408318721 in words is "twelve billion, four hundred eight million, three hundred eighteen thousand, seven hundred twenty-one".