21303110303 has 4 divisors (see below), whose sum is σ = 21304520760. Its totient is φ = 21301699848.

The previous prime is 21303110299. The next prime is 21303110341. The reversal of 21303110303 is 30301130312.

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 21303110303 - 2² = 21303110299 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 (21303110383) 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, 682325 + ... + 712862.

It is an arithmetic number, because the mean of its divisors is an integer number (5326130190).

Almost surely, 2^21303110303 is an apocalyptic number.

21303110303 is a deficient number, since it is larger than the sum of its proper divisors (1410457).

21303110303 is a wasteful number, since it uses less digits than its factorization.

21303110303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1410456.

The product of its (nonzero) digits is 162, while the sum is 17.

Adding to 21303110303 its reverse (30301130312), we get a palindrome (51604240615).

The spelling of 21303110303 in words is "twenty-one billion, three hundred three million, one hundred ten thousand, three hundred three".