21343303 has 4 divisors (see below), whose sum is σ = 21371688. Its totient is φ = 21314920.

The previous prime is 21343261. The next prime is 21343307. The reversal of 21343303 is 30334312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21343303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21343307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13033 + ... + 14578.

It is an arithmetic number, because the mean of its divisors is an integer number (5342922).

Almost surely, 2^21343303 is an apocalyptic number.

21343303 is a deficient number, since it is larger than the sum of its proper divisors (28385).

21343303 is an equidigital number, since it uses as much as digits as its factorization.

21343303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28384.

The product of its (nonzero) digits is 648, while the sum is 19.

The square root of 21343303 is about 4619.8812755308. The cubic root of 21343303 is about 277.3877066418.

Adding to 21343303 its reverse (30334312), we get a palindrome (51677615).

The spelling of 21343303 in words is "twenty-one million, three hundred forty-three thousand, three hundred three".