20121331323 has 4 divisors (see below), whose sum is σ = 26828441768. Its totient is φ = 13414220880.

The previous prime is 20121331313. The next prime is 20121331331. The reversal of 20121331323 is 32313312102.

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

It is not a de Polignac number, because 20121331323 - 2⁸ = 20121331067 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 20121331323.

It is not an unprimeable number, because it can be changed into a prime (20121331313) 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, 3353555218 + ... + 3353555223.

It is an arithmetic number, because the mean of its divisors is an integer number (6707110442).

Almost surely, 2^20121331323 is an apocalyptic number.

20121331323 is a deficient number, since it is larger than the sum of its proper divisors (6707110445).

20121331323 is an equidigital number, since it uses as much as digits as its factorization.

20121331323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6707110444.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 20121331323 its reverse (32313312102), we get a palindrome (52434643425).

The spelling of 20121331323 in words is "twenty billion, one hundred twenty-one million, three hundred thirty-one thousand, three hundred twenty-three".