12973445621 has 2 divisors, whose sum is σ = 12973445622. Its totient is φ = 12973445620.

The previous prime is 12973445593. The next prime is 12973445627. The reversal of 12973445621 is 12654437921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9034502500 + 3938943121 = 95050^2 + 62761^2 .

It is a cyclic number.

It is not a de Polignac number, because 12973445621 - 2⁶ = 12973445557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12973445627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6486722810 + 6486722811.

It is an arithmetic number, because the mean of its divisors is an integer number (6486722811).

Almost surely, 2^12973445621 is an apocalyptic number.

It is an amenable number.

12973445621 is a deficient number, since it is larger than the sum of its proper divisors (1).

12973445621 is an equidigital number, since it uses as much as digits as its factorization.

12973445621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 44.

The spelling of 12973445621 in words is "twelve billion, nine hundred seventy-three million, four hundred forty-five thousand, six hundred twenty-one".