12407399721 has 16 divisors (see below), whose sum is σ = 18385819200. Its totient is φ = 8269581024.

The previous prime is 12407399707. The next prime is 12407399723. The reversal of 12407399721 is 12799370421.

12407399721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12407399721 - 2⁷ = 12407399593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12407399723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61045 + ... + 168941.

It is an arithmetic number, because the mean of its divisors is an integer number (1149113700).

Almost surely, 2^12407399721 is an apocalyptic number.

It is an amenable number.

12407399721 is a deficient number, since it is larger than the sum of its proper divisors (5978419479).

12407399721 is a wasteful number, since it uses less digits than its factorization.

12407399721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112165 (or 112159 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 45.

The spelling of 12407399721 in words is "twelve billion, four hundred seven million, three hundred ninety-nine thousand, seven hundred twenty-one".