21344313 has 8 divisors (see below), whose sum is σ = 29153376. Its totient is φ = 13882400.

The previous prime is 21344311. The next prime is 21344339. The reversal of 21344313 is 31344312.

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

It is a cyclic number.

It is not a de Polignac number, because 21344313 - 2¹ = 21344311 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21344313.

It is not an unprimeable number, because it can be changed into a prime (21344311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86643 + ... + 86888.

It is an arithmetic number, because the mean of its divisors is an integer number (3644172).

Almost surely, 2^21344313 is an apocalyptic number.

It is an amenable number.

21344313 is a deficient number, since it is larger than the sum of its proper divisors (7809063).

21344313 is a wasteful number, since it uses less digits than its factorization.

21344313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173575.

The product of its digits is 864, while the sum is 21.

The square root of 21344313 is about 4619.9905844060. The cubic root of 21344313 is about 277.3920820528.

Adding to 21344313 its reverse (31344312), we get a palindrome (52688625).

Subtracting 21344313 from its reverse (31344312), we obtain a palindrome (9999999).

The spelling of 21344313 in words is "twenty-one million, three hundred forty-four thousand, three hundred thirteen".