12715445621 has 2 divisors, whose sum is σ = 12715445622. Its totient is φ = 12715445620.

The previous prime is 12715445609. The next prime is 12715445627. The reversal of 12715445621 is 12654451721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8540347396 + 4175098225 = 92414^2 + 64615^2 .

It is a cyclic number.

It is not a de Polignac number, because 12715445621 - 2²² = 12711251317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12715445627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6357722810 + 6357722811.

It is an arithmetic number, because the mean of its divisors is an integer number (6357722811).

Almost surely, 2^12715445621 is an apocalyptic number.

It is an amenable number.

12715445621 is a deficient number, since it is larger than the sum of its proper divisors (1).

12715445621 is an equidigital number, since it uses as much as digits as its factorization.

12715445621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 67200, while the sum is 38.

The spelling of 12715445621 in words is "twelve billion, seven hundred fifteen million, four hundred forty-five thousand, six hundred twenty-one".