21310322317 has 2 divisors, whose sum is σ = 21310322318. Its totient is φ = 21310322316.

The previous prime is 21310322303. The next prime is 21310322333. The reversal of 21310322317 is 71322301312.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20668662756 + 641659561 = 143766^2 + 25331^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21310322317 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21310322291 and 21310322300.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21310322357) 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, 10655161158 + 10655161159.

It is an arithmetic number, because the mean of its divisors is an integer number (10655161159).

Almost surely, 2^21310322317 is an apocalyptic number.

It is an amenable number.

21310322317 is a deficient number, since it is larger than the sum of its proper divisors (1).

21310322317 is an equidigital number, since it uses as much as digits as its factorization.

21310322317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 25.

Adding to 21310322317 its reverse (71322301312), we get a palindrome (92632623629).

The spelling of 21310322317 in words is "twenty-one billion, three hundred ten million, three hundred twenty-two thousand, three hundred seventeen".