21422043317 has 2 divisors, whose sum is σ = 21422043318. Its totient is φ = 21422043316.

The previous prime is 21422043311. The next prime is 21422043371. The reversal of 21422043317 is 71334022412.

Together with next prime (21422043371) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18164031076 + 3258012241 = 134774^2 + 57079^2 .

It is a cyclic number.

It is not a de Polignac number, because 21422043317 - 2⁸ = 21422043061 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21422043317.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21422043311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10711021658 + 10711021659.

It is an arithmetic number, because the mean of its divisors is an integer number (10711021659).

Almost surely, 2^21422043317 is an apocalyptic number.

It is an amenable number.

21422043317 is a deficient number, since it is larger than the sum of its proper divisors (1).

21422043317 is an equidigital number, since it uses as much as digits as its factorization.

21422043317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 29.

Adding to 21422043317 its reverse (71334022412), we get a palindrome (92756065729).

The spelling of 21422043317 in words is "twenty-one billion, four hundred twenty-two million, forty-three thousand, three hundred seventeen".