21331003323 has 16 divisors (see below), whose sum is σ = 32523984896. Its totient is φ = 12181795200.

The previous prime is 21331003303. The next prime is 21331003363. The reversal of 21331003323 is 32330013312.

It is not a de Polignac number, because 21331003323 - 2¹⁴ = 21330986939 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

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 21331003323.

It is not an unprimeable number, because it can be changed into a prime (21331003303) 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 15 ways as a sum of consecutive naturals, for example, 270478 + ... + 340323.

It is an arithmetic number, because the mean of its divisors is an integer number (2032749056).

Almost surely, 2^21331003323 is an apocalyptic number.

21331003323 is a deficient number, since it is larger than the sum of its proper divisors (11192981573).

21331003323 is a wasteful number, since it uses less digits than its factorization.

21331003323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612474.

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

Adding to 21331003323 its reverse (32330013312), we get a palindrome (53661016635).

The spelling of 21331003323 in words is "twenty-one billion, three hundred thirty-one million, three thousand, three hundred twenty-three".