21350343317 has 2 divisors, whose sum is σ = 21350343318. Its totient is φ = 21350343316.

The previous prime is 21350343293. The next prime is 21350343341. The reversal of 21350343317 is 71334305312.

It is a balanced prime because it is at equal distance from previous prime (21350343293) and next prime (21350343341).

It can be written as a sum of positive squares in only one way, i.e., 11472766321 + 9877576996 = 107111^2 + 99386^2 .

It is a cyclic number.

It is not a de Polignac number, because 21350343317 - 2³⁰ = 20276601493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21350342317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10675171658 + 10675171659.

It is an arithmetic number, because the mean of its divisors is an integer number (10675171659).

Almost surely, 2^21350343317 is an apocalyptic number.

It is an amenable number.

21350343317 is a deficient number, since it is larger than the sum of its proper divisors (1).

21350343317 is an equidigital number, since it uses as much as digits as its factorization.

21350343317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 32.

Adding to 21350343317 its reverse (71334305312), we get a palindrome (92684648629).

The spelling of 21350343317 in words is "twenty-one billion, three hundred fifty million, three hundred forty-three thousand, three hundred seventeen".