21310302323 has 4 divisors (see below), whose sum is σ = 21310605000. Its totient is φ = 21309999648.

The previous prime is 21310302241. The next prime is 21310302389. The reversal of 21310302323 is 32320301312.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21310302323 - 2³² = 17015335027 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21310302295 and 21310302304.

It is not an unprimeable number, because it can be changed into a prime (21310302623) 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, 15803 + ... + 207051.

It is an arithmetic number, because the mean of its divisors is an integer number (5327651250).

Almost surely, 2^21310302323 is an apocalyptic number.

21310302323 is a deficient number, since it is larger than the sum of its proper divisors (302677).

21310302323 is a wasteful number, since it uses less digits than its factorization.

21310302323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302676.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21310302323 its reverse (32320301312), we get a palindrome (53630603635).

The spelling of 21310302323 in words is "twenty-one billion, three hundred ten million, three hundred two thousand, three hundred twenty-three".