12406045721 has 8 divisors (see below), whose sum is σ = 13052110344. Its totient is φ = 11776337280.

The previous prime is 12406045703. The next prime is 12406045723. The reversal of 12406045721 is 12754060421.

It can be written as a sum of positive squares in 4 ways, for example, as 1172377600 + 11233668121 = 34240^2 + 105989^2 .

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 12406045721 - 2⁶ = 12406045657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12406045723) 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, 4087490 + ... + 4090523.

It is an arithmetic number, because the mean of its divisors is an integer number (1631513793).

Almost surely, 2^12406045721 is an apocalyptic number.

It is an amenable number.

12406045721 is a deficient number, since it is larger than the sum of its proper divisors (646064623).

12406045721 is an equidigital number, since it uses as much as digits as its factorization.

12406045721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8178091.

The product of its (nonzero) digits is 13440, while the sum is 32.

The spelling of 12406045721 in words is "twelve billion, four hundred six million, forty-five thousand, seven hundred twenty-one".