21313121323 has 8 divisors (see below), whose sum is σ = 24302744928. Its totient is φ = 18516376704.

The previous prime is 21313121321. The next prime is 21313121329. The reversal of 21313121323 is 32312131312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21313121323 - 2¹ = 21313121321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21313121294 and 21313121303.

It is not an unprimeable number, because it can be changed into a prime (21313121321) 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 7 ways as a sum of consecutive naturals, for example, 48219511 + ... + 48219952.

It is an arithmetic number, because the mean of its divisors is an integer number (3037843116).

Almost surely, 2^21313121323 is an apocalyptic number.

21313121323 is a deficient number, since it is larger than the sum of its proper divisors (2989623605).

21313121323 is a wasteful number, since it uses less digits than its factorization.

21313121323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96439493.

The product of its digits is 648, while the sum is 22.

Adding to 21313121323 its reverse (32312131312), we get a palindrome (53625252635).

The spelling of 21313121323 in words is "twenty-one billion, three hundred thirteen million, one hundred twenty-one thousand, three hundred twenty-three".