21024330317 has 2 divisors, whose sum is σ = 21024330318. Its totient is φ = 21024330316.

The previous prime is 21024330311. The next prime is 21024330329. The reversal of 21024330317 is 71303342012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21017460676 + 6869641 = 144974^2 + 2621^2 .

It is a cyclic number.

It is not a de Polignac number, because 21024330317 - 2¹⁸ = 21024068173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21024330311) 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, 10512165158 + 10512165159.

It is an arithmetic number, because the mean of its divisors is an integer number (10512165159).

Almost surely, 2^21024330317 is an apocalyptic number.

It is an amenable number.

21024330317 is a deficient number, since it is larger than the sum of its proper divisors (1).

21024330317 is an equidigital number, since it uses as much as digits as its factorization.

21024330317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 26.

Adding to 21024330317 its reverse (71303342012), we get a palindrome (92327672329).

The spelling of 21024330317 in words is "twenty-one billion, twenty-four million, three hundred thirty thousand, three hundred seventeen".