21344323073 has 2 divisors, whose sum is σ = 21344323074. Its totient is φ = 21344323072.

The previous prime is 21344323069. The next prime is 21344323087. The reversal of 21344323073 is 37032344312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13794972304 + 7549350769 = 117452^2 + 86887^2 .

It is a cyclic number.

It is not a de Polignac number, because 21344323073 - 2² = 21344323069 is a prime.

It is not a weakly prime, because it can be changed into another prime (21344323043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10672161536 + 10672161537.

It is an arithmetic number, because the mean of its divisors is an integer number (10672161537).

Almost surely, 2^21344323073 is an apocalyptic number.

It is an amenable number.

21344323073 is a deficient number, since it is larger than the sum of its proper divisors (1).

21344323073 is an equidigital number, since it uses as much as digits as its factorization.

21344323073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 32.

Adding to 21344323073 its reverse (37032344312), we get a palindrome (58376667385).

The spelling of 21344323073 in words is "twenty-one billion, three hundred forty-four million, three hundred twenty-three thousand, seventy-three".