21303310323 has 8 divisors (see below), whose sum is σ = 28470014608. Its totient is φ = 14169406464.

The previous prime is 21303310319. The next prime is 21303310331. The reversal of 21303310323 is 32301330312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21303310323 - 2² = 21303310319 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21303310323.

It is not an unprimeable number, because it can be changed into a prime (21303310333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8198590 + ... + 8201187.

It is an arithmetic number, because the mean of its divisors is an integer number (3558751826).

Almost surely, 2^21303310323 is an apocalyptic number.

21303310323 is a deficient number, since it is larger than the sum of its proper divisors (7166704285).

21303310323 is a wasteful number, since it uses less digits than its factorization.

21303310323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16400213.

The product of its (nonzero) digits is 972, while the sum is 21.

Adding to 21303310323 its reverse (32301330312), we get a palindrome (53604640635).

The spelling of 21303310323 in words is "twenty-one billion, three hundred three million, three hundred ten thousand, three hundred twenty-three".