21343313 has 8 divisors (see below), whose sum is σ = 22647240. Its totient is φ = 20044800.

The previous prime is 21343307. The next prime is 21343331. The reversal of 21343313 is 31334312.

It can be written as a sum of positive squares in 4 ways, for example, as 14010049 + 7333264 = 3743^2 + 2708^2 .

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 21343313 - 2⁶ = 21343249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21343363) 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, 9173 + ... + 11261.

It is an arithmetic number, because the mean of its divisors is an integer number (2830905).

Almost surely, 2^21343313 is an apocalyptic number.

It is an amenable number.

21343313 is a deficient number, since it is larger than the sum of its proper divisors (1303927).

21343313 is a wasteful number, since it uses less digits than its factorization.

21343313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2707.

The product of its digits is 648, while the sum is 20.

The square root of 21343313 is about 4619.8823578096. The cubic root of 21343313 is about 277.3877499634.

Adding to 21343313 its reverse (31334312), we get a palindrome (52677625).

Subtracting 21343313 from its reverse (31334312), we obtain a palindrome (9990999).

The spelling of 21343313 in words is "twenty-one million, three hundred forty-three thousand, three hundred thirteen".