21211022317 has 2 divisors, whose sum is σ = 21211022318. Its totient is φ = 21211022316.

The previous prime is 21211022311. The next prime is 21211022323. The reversal of 21211022317 is 71322011212.

It is a balanced prime because it is at equal distance from previous prime (21211022311) and next prime (21211022323).

It can be written as a sum of positive squares in only one way, i.e., 13430723881 + 7780298436 = 115891^2 + 88206^2 .

It is a cyclic number.

It is not a de Polignac number, because 21211022317 - 2¹¹ = 21211020269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21211022311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605511158 + 10605511159.

It is an arithmetic number, because the mean of its divisors is an integer number (10605511159).

Almost surely, 2^21211022317 is an apocalyptic number.

It is an amenable number.

21211022317 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211022317 is an equidigital number, since it uses as much as digits as its factorization.

21211022317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 22.

Adding to 21211022317 its reverse (71322011212), we get a palindrome (92533033529).

The spelling of 21211022317 in words is "twenty-one billion, two hundred eleven million, twenty-two thousand, three hundred seventeen".