1321131223 has 4 divisors (see below), whose sum is σ = 1325122888. Its totient is φ = 1317139560.

The previous prime is 1321131211. The next prime is 1321131241. The reversal of 1321131223 is 3221311231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3221311231 = 3359 ⋅959009.

It is a cyclic number.

It is not a de Polignac number, because 1321131223 - 2⁹ = 1321130711 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 1321131223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321131263) 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, 1995336 + ... + 1995997.

It is an arithmetic number, because the mean of its divisors is an integer number (331280722).

Almost surely, 2^1321131223 is an apocalyptic number.

1321131223 is a deficient number, since it is larger than the sum of its proper divisors (3991665).

1321131223 is an equidigital number, since it uses as much as digits as its factorization.

1321131223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3991664.

The product of its digits is 216, while the sum is 19.

The square root of 1321131223 is about 36347.3688593824. The cubic root of 1321131223 is about 1097.2745815856.

Adding to 1321131223 its reverse (3221311231), we get a palindrome (4542442454).

The spelling of 1321131223 in words is "one billion, three hundred twenty-one million, one hundred thirty-one thousand, two hundred twenty-three".