21320303303 has 16 divisors (see below), whose sum is σ = 23418393600. Its totient is φ = 19291240800.

The previous prime is 21320303299. The next prime is 21320303321. The reversal of 21320303303 is 30330302312.

It is not a de Polignac number, because 21320303303 - 2² = 21320303299 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 (21320303203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68078 + ... + 217428.

It is an arithmetic number, because the mean of its divisors is an integer number (1463649600).

Almost surely, 2^21320303303 is an apocalyptic number.

21320303303 is a deficient number, since it is larger than the sum of its proper divisors (2098090297).

21320303303 is a wasteful number, since it uses less digits than its factorization.

21320303303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149582.

The product of its (nonzero) digits is 972, while the sum is 20.

Adding to 21320303303 its reverse (30330302312), we get a palindrome (51650605615).

Subtracting 21320303303 from its reverse (30330302312), we obtain a palindrome (9009999009).

The spelling of 21320303303 in words is "twenty-one billion, three hundred twenty million, three hundred three thousand, three hundred three".