21304232717 has 2 divisors, whose sum is σ = 21304232718. Its totient is φ = 21304232716.

The previous prime is 21304232707. The next prime is 21304232759. The reversal of 21304232717 is 71723240312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19035996841 + 2268235876 = 137971^2 + 47626^2 .

It is a cyclic number.

It is not a de Polignac number, because 21304232717 - 2¹⁰ = 21304231693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21304232707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10652116358 + 10652116359.

It is an arithmetic number, because the mean of its divisors is an integer number (10652116359).

Almost surely, 2^21304232717 is an apocalyptic number.

It is an amenable number.

21304232717 is a deficient number, since it is larger than the sum of its proper divisors (1).

21304232717 is an equidigital number, since it uses as much as digits as its factorization.

21304232717 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14112, while the sum is 32.

The spelling of 21304232717 in words is "twenty-one billion, three hundred four million, two hundred thirty-two thousand, seven hundred seventeen".