21303323303 has 4 divisors (see below), whose sum is σ = 21303722448. Its totient is φ = 21302924160.

The previous prime is 21303323299. The next prime is 21303323311. The reversal of 21303323303 is 30332330312.

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

It is a cyclic number.

It is not a de Polignac number, because 21303323303 - 2² = 21303323299 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 (21303323333) 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, 104378 + ... + 231303.

It is an arithmetic number, because the mean of its divisors is an integer number (5325930612).

Almost surely, 2^21303323303 is an apocalyptic number.

21303323303 is a deficient number, since it is larger than the sum of its proper divisors (399145).

21303323303 is an equidigital number, since it uses as much as digits as its factorization.

21303323303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399144.

The product of its (nonzero) digits is 2916, while the sum is 23.

Adding to 21303323303 its reverse (30332330312), we get a palindrome (51635653615).

The spelling of 21303323303 in words is "twenty-one billion, three hundred three million, three hundred twenty-three thousand, three hundred three".