21124344317 has 2 divisors, whose sum is σ = 21124344318. Its totient is φ = 21124344316.

The previous prime is 21124344259. The next prime is 21124344349. The reversal of 21124344317 is 71344342112.

It is an a-pointer prime, because the next prime (21124344349) can be obtained adding 21124344317 to its sum of digits (32).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14402640121 + 6721704196 = 120011^2 + 81986^2 .

It is a cyclic number.

It is not a de Polignac number, because 21124344317 - 2⁶ = 21124344253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21124344617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10562172158 + 10562172159.

It is an arithmetic number, because the mean of its divisors is an integer number (10562172159).

Almost surely, 2^21124344317 is an apocalyptic number.

It is an amenable number.

21124344317 is a deficient number, since it is larger than the sum of its proper divisors (1).

21124344317 is an equidigital number, since it uses as much as digits as its factorization.

21124344317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 32.

Adding to 21124344317 its reverse (71344342112), we get a palindrome (92468686429).

The spelling of 21124344317 in words is "twenty-one billion, one hundred twenty-four million, three hundred forty-four thousand, three hundred seventeen".