21002323323 has 4 divisors (see below), whose sum is σ = 28003097768. Its totient is φ = 14001548880.

The previous prime is 21002323319. The next prime is 21002323327. The reversal of 21002323323 is 32332320012.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21002323319) and next prime (21002323327).

It is not a de Polignac number, because 21002323323 - 2² = 21002323319 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 21002323323.

It is not an unprimeable number, because it can be changed into a prime (21002323327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3500387218 + ... + 3500387223.

It is an arithmetic number, because the mean of its divisors is an integer number (7000774442).

Almost surely, 2^21002323323 is an apocalyptic number.

21002323323 is a deficient number, since it is larger than the sum of its proper divisors (7000774445).

21002323323 is an equidigital number, since it uses as much as digits as its factorization.

21002323323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7000774444.

The product of its (nonzero) digits is 1296, while the sum is 21.

Adding to 21002323323 its reverse (32332320012), we get a palindrome (53334643335).

The spelling of 21002323323 in words is "twenty-one billion, two million, three hundred twenty-three thousand, three hundred twenty-three".