21839005717 has 2 divisors, whose sum is σ = 21839005718. Its totient is φ = 21839005716.

The previous prime is 21839005691. The next prime is 21839005729. The reversal of 21839005717 is 71750093812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14039643121 + 7799362596 = 118489^2 + 88314^2 .

It is a cyclic number.

It is not a de Polignac number, because 21839005717 - 2⁷ = 21839005589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21839005787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10919502858 + 10919502859.

It is an arithmetic number, because the mean of its divisors is an integer number (10919502859).

Almost surely, 2^21839005717 is an apocalyptic number.

It is an amenable number.

21839005717 is a deficient number, since it is larger than the sum of its proper divisors (1).

21839005717 is an equidigital number, since it uses as much as digits as its factorization.

21839005717 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 105840, while the sum is 43.

The spelling of 21839005717 in words is "twenty-one billion, eight hundred thirty-nine million, five thousand, seven hundred seventeen".