17383791421 has 2 divisors, whose sum is σ = 17383791422. Its totient is φ = 17383791420.

The previous prime is 17383791413. The next prime is 17383791457. The reversal of 17383791421 is 12419738371.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17040430521 + 343360900 = 130539^2 + 18530^2 .

It is a cyclic number.

It is not a de Polignac number, because 17383791421 - 2³ = 17383791413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17383791121) 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 as a sum of consecutive naturals, namely, 8691895710 + 8691895711.

It is an arithmetic number, because the mean of its divisors is an integer number (8691895711).

Almost surely, 2^17383791421 is an apocalyptic number.

It is an amenable number.

17383791421 is a deficient number, since it is larger than the sum of its proper divisors (1).

17383791421 is an equidigital number, since it uses as much as digits as its factorization.

17383791421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 46.

The spelling of 17383791421 in words is "seventeen billion, three hundred eighty-three million, seven hundred ninety-one thousand, four hundred twenty-one".