21422423317 has 2 divisors, whose sum is σ = 21422423318. Its totient is φ = 21422423316.

The previous prime is 21422423293. The next prime is 21422423329. The reversal of 21422423317 is 71332422412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16997379876 + 4425043441 = 130374^2 + 66521^2 .

It is a cyclic number.

It is not a de Polignac number, because 21422423317 - 2¹¹ = 21422421269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21422423377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10711211658 + 10711211659.

It is an arithmetic number, because the mean of its divisors is an integer number (10711211659).

Almost surely, 2^21422423317 is an apocalyptic number.

It is an amenable number.

21422423317 is a deficient number, since it is larger than the sum of its proper divisors (1).

21422423317 is an equidigital number, since it uses as much as digits as its factorization.

21422423317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 31.

Adding to 21422423317 its reverse (71332422412), we get a palindrome (92754845729).

The spelling of 21422423317 in words is "twenty-one billion, four hundred twenty-two million, four hundred twenty-three thousand, three hundred seventeen".