12605460821 has 4 divisors (see below), whose sum is σ = 12605761644. Its totient is φ = 12605160000.

The previous prime is 12605460817. The next prime is 12605460853. The reversal of 12605460821 is 12806450621.

12605460821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 10340652721 + 2264808100 = 101689^2 + 47590^2 .

It is a cyclic number.

It is not a de Polignac number, because 12605460821 - 2² = 12605460817 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12605450821) 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 3 ways as a sum of consecutive naturals, for example, 74930 + ... + 175571.

It is an arithmetic number, because the mean of its divisors is an integer number (3151440411).

Almost surely, 2^12605460821 is an apocalyptic number.

It is an amenable number.

12605460821 is a deficient number, since it is larger than the sum of its proper divisors (300823).

12605460821 is an equidigital number, since it uses as much as digits as its factorization.

12605460821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300822.

The product of its (nonzero) digits is 23040, while the sum is 35.

The spelling of 12605460821 in words is "twelve billion, six hundred five million, four hundred sixty thousand, eight hundred twenty-one".