21317383432673 has 2 divisors, whose sum is σ = 21317383432674. Its totient is φ = 21317383432672.

The previous prime is 21317383432649. The next prime is 21317383432687. The reversal of 21317383432673 is 37623438371312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20899462557649 + 417920875024 = 4571593^2 + 646468^2 .

It is a cyclic number.

It is not a de Polignac number, because 21317383432673 - 2¹² = 21317383428577 is a prime.

It is not a weakly prime, because it can be changed into another prime (21317383432693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10658691716336 + 10658691716337.

It is an arithmetic number, because the mean of its divisors is an integer number (10658691716337).

Almost surely, 2^{21317383432673} is an apocalyptic number.

It is an amenable number.

21317383432673 is a deficient number, since it is larger than the sum of its proper divisors (1).

21317383432673 is an equidigital number, since it uses as much as digits as its factorization.

21317383432673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9144576, while the sum is 53.

The spelling of 21317383432673 in words is "twenty-one trillion, three hundred seventeen billion, three hundred eighty-three million, four hundred thirty-two thousand, six hundred seventy-three".