21331031303 has 4 divisors (see below), whose sum is σ = 21420282720. Its totient is φ = 21241779888.

The previous prime is 21331031297. The next prime is 21331031363. The reversal of 21331031303 is 30313013312.

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 21331031303 - 2¹⁶ = 21330965767 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 (21331031363) 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, 44625350 + ... + 44625827.

It is an arithmetic number, because the mean of its divisors is an integer number (5355070680).

Almost surely, 2^21331031303 is an apocalyptic number.

21331031303 is a deficient number, since it is larger than the sum of its proper divisors (89251417).

21331031303 is an equidigital number, since it uses as much as digits as its factorization.

21331031303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89251416.

The product of its (nonzero) digits is 486, while the sum is 20.

Adding to 21331031303 its reverse (30313013312), we get a palindrome (51644044615).

The spelling of 21331031303 in words is "twenty-one billion, three hundred thirty-one million, thirty-one thousand, three hundred three".