21233310317 has 2 divisors, whose sum is σ = 21233310318. Its totient is φ = 21233310316.

The previous prime is 21233310257. The next prime is 21233310323. The reversal of 21233310317 is 71301333212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17863391716 + 3369918601 = 133654^2 + 58051^2 .

It is a cyclic number.

It is not a de Polignac number, because 21233310317 - 2⁶ = 21233310253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21233310347) 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, 10616655158 + 10616655159.

It is an arithmetic number, because the mean of its divisors is an integer number (10616655159).

Almost surely, 2^21233310317 is an apocalyptic number.

It is an amenable number.

21233310317 is a deficient number, since it is larger than the sum of its proper divisors (1).

21233310317 is an equidigital number, since it uses as much as digits as its factorization.

21233310317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 26.

Adding to 21233310317 its reverse (71301333212), we get a palindrome (92534643529).

The spelling of 21233310317 in words is "twenty-one billion, two hundred thirty-three million, three hundred ten thousand, three hundred seventeen".