21313323 has 12 divisors (see below), whose sum is σ = 31092048. Its totient is φ = 14067600.

The previous prime is 21313301. The next prime is 21313333. The reversal of 21313323 is 32331312.

It is not a de Polignac number, because 21313323 - 2¹⁰ = 21312299 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21313296 and 21313305.

It is not an unprimeable number, because it can be changed into a prime (21313333) 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 in 11 ways as a sum of consecutive naturals, for example, 10815 + ... + 12632.

It is an arithmetic number, because the mean of its divisors is an integer number (2591004).

Almost surely, 2^21313323 is an apocalyptic number.

21313323 is a deficient number, since it is larger than the sum of its proper divisors (9778725).

21313323 is a wasteful number, since it uses less digits than its factorization.

21313323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23554 (or 23551 counting only the distinct ones).

The product of its digits is 324, while the sum is 18.

The square root of 21313323 is about 4616.6354631918. The cubic root of 21313323 is about 277.2577676748.

Adding to 21313323 its reverse (32331312), we get a palindrome (53644635).

The spelling of 21313323 in words is "twenty-one million, three hundred thirteen thousand, three hundred twenty-three".