21332031317 has 2 divisors, whose sum is σ = 21332031318. Its totient is φ = 21332031316.

The previous prime is 21332031269. The next prime is 21332031337. The reversal of 21332031317 is 71313023312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21248601361 + 83429956 = 145769^2 + 9134^2 .

It is a cyclic number.

It is not a de Polignac number, because 21332031317 - 2³² = 17037064021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21332031337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10666015658 + 10666015659.

It is an arithmetic number, because the mean of its divisors is an integer number (10666015659).

Almost surely, 2^21332031317 is an apocalyptic number.

It is an amenable number.

21332031317 is a deficient number, since it is larger than the sum of its proper divisors (1).

21332031317 is an equidigital number, since it uses as much as digits as its factorization.

21332031317 is an evil number, because the sum of its binary digits is even.

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

Adding to 21332031317 its reverse (71313023312), we get a palindrome (92645054629).

The spelling of 21332031317 in words is "twenty-one billion, three hundred thirty-two million, thirty-one thousand, three hundred seventeen".