21335453317 has 2 divisors, whose sum is σ = 21335453318. Its totient is φ = 21335453316.

The previous prime is 21335453297. The next prime is 21335453341. The reversal of 21335453317 is 71335453312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20832303556 + 503149761 = 144334^2 + 22431^2 .

It is a cyclic number.

It is not a de Polignac number, because 21335453317 - 2¹⁹ = 21334929029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21335453387) 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, 10667726658 + 10667726659.

It is an arithmetic number, because the mean of its divisors is an integer number (10667726659).

Almost surely, 2^21335453317 is an apocalyptic number.

It is an amenable number.

21335453317 is a deficient number, since it is larger than the sum of its proper divisors (1).

21335453317 is an equidigital number, since it uses as much as digits as its factorization.

21335453317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 113400, while the sum is 37.

The spelling of 21335453317 in words is "twenty-one billion, three hundred thirty-five million, four hundred fifty-three thousand, three hundred seventeen".