21344423321 has 8 divisors (see below), whose sum is σ = 24338437704. Its totient is φ = 18543571200.

The previous prime is 21344423263. The next prime is 21344423323. The reversal of 21344423321 is 12332444312.

It can be written as a sum of positive squares in 4 ways, for example, as 1859334400 + 19485088921 = 43120^2 + 139589^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21344423321 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21344423323) 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 in 7 ways as a sum of consecutive naturals, for example, 48290330 + ... + 48290771.

It is an arithmetic number, because the mean of its divisors is an integer number (3042304713).

Almost surely, 2^21344423321 is an apocalyptic number.

It is an amenable number.

21344423321 is a deficient number, since it is larger than the sum of its proper divisors (2994014383).

21344423321 is a wasteful number, since it uses less digits than its factorization.

21344423321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96581131.

The product of its digits is 13824, while the sum is 29.

Adding to 21344423321 its reverse (12332444312), we get a palindrome (33676867633).

The spelling of 21344423321 in words is "twenty-one billion, three hundred forty-four million, four hundred twenty-three thousand, three hundred twenty-one".