21313331323 has 4 divisors (see below), whose sum is σ = 21313911888. Its totient is φ = 21312750760.

The previous prime is 21313331321. The next prime is 21313331353. The reversal of 21313331323 is 32313331312.

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 21313331323 - 2¹ = 21313331321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21313331321) 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, 231208 + ... + 309973.

It is an arithmetic number, because the mean of its divisors is an integer number (5328477972).

Almost surely, 2^21313331323 is an apocalyptic number.

21313331323 is a deficient number, since it is larger than the sum of its proper divisors (580565).

21313331323 is an equidigital number, since it uses as much as digits as its factorization.

21313331323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 580564.

The product of its digits is 2916, while the sum is 25.

Adding to 21313331323 its reverse (32313331312), we get a palindrome (53626662635).

The spelling of 21313331323 in words is "twenty-one billion, three hundred thirteen million, three hundred thirty-one thousand, three hundred twenty-three".