1321231323 has 4 divisors (see below), whose sum is σ = 1761641768. Its totient is φ = 880820880.

The previous prime is 1321231321. The next prime is 1321231337. The reversal of 1321231323 is 3231321231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3231321231 = 3 ⋅1077107077.

It is not a de Polignac number, because 1321231323 - 2¹ = 1321231321 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 1321231323.

It is not an unprimeable number, because it can be changed into a prime (1321231321) 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, 220205218 + ... + 220205223.

It is an arithmetic number, because the mean of its divisors is an integer number (440410442).

Almost surely, 2^1321231323 is an apocalyptic number.

1321231323 is a deficient number, since it is larger than the sum of its proper divisors (440410445).

1321231323 is an equidigital number, since it uses as much as digits as its factorization.

1321231323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440410444.

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

The square root of 1321231323 is about 36348.7458243060. The cubic root of 1321231323 is about 1097.3022937992.

Adding to 1321231323 its reverse (3231321231), we get a palindrome (4552552554).

The spelling of 1321231323 in words is "one billion, three hundred twenty-one million, two hundred thirty-one thousand, three hundred twenty-three".