21313332323 has 4 divisors (see below), whose sum is σ = 21315509688. Its totient is φ = 21311154960.

The previous prime is 21313332311. The next prime is 21313332349. The reversal of 21313332323 is 32323331312.

It is a happy number.

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 21313332323 - 2¹⁶ = 21313266787 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21313332292 and 21313332301.

It is not an unprimeable number, because it can be changed into a prime (21313332373) 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, 1073933 + ... + 1093598.

It is an arithmetic number, because the mean of its divisors is an integer number (5328877422).

Almost surely, 2^21313332323 is an apocalyptic number.

21313332323 is a deficient number, since it is larger than the sum of its proper divisors (2177365).

21313332323 is an equidigital number, since it uses as much as digits as its factorization.

21313332323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2177364.

The product of its digits is 5832, while the sum is 26.

Adding to 21313332323 its reverse (32323331312), we get a palindrome (53636663635).

The spelling of 21313332323 in words is "twenty-one billion, three hundred thirteen million, three hundred thirty-two thousand, three hundred twenty-three".