4393239673621 has 2 divisors, whose sum is σ = 4393239673622. Its totient is φ = 4393239673620.

The previous prime is 4393239673517. The next prime is 4393239673643. The reversal of 4393239673621 is 1263769323934.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2963266159396 + 1429973514225 = 1721414^2 + 1195815^2 .

It is a cyclic number.

It is not a de Polignac number, because 4393239673621 - 2¹³ = 4393239665429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4393239673721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2196619836810 + 2196619836811.

It is an arithmetic number, because the mean of its divisors is an integer number (2196619836811).

Almost surely, 2^{4393239673621} is an apocalyptic number.

It is an amenable number.

4393239673621 is a deficient number, since it is larger than the sum of its proper divisors (1).

4393239673621 is an equidigital number, since it uses as much as digits as its factorization.

4393239673621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26453952, while the sum is 58.

The spelling of 4393239673621 in words is "four trillion, three hundred ninety-three billion, two hundred thirty-nine million, six hundred seventy-three thousand, six hundred twenty-one".