1323142221 has 4 divisors (see below), whose sum is σ = 1764189632. Its totient is φ = 882094812.

The previous prime is 1323142213. The next prime is 1323142243. The reversal of 1323142221 is 1222413231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1323142221 - 2³ = 1323142213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1323142291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220523701 + ... + 220523706.

It is an arithmetic number, because the mean of its divisors is an integer number (441047408).

Almost surely, 2^1323142221 is an apocalyptic number.

It is an amenable number.

1323142221 is a deficient number, since it is larger than the sum of its proper divisors (441047411).

1323142221 is an equidigital number, since it uses as much as digits as its factorization.

1323142221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441047410.

The product of its digits is 576, while the sum is 21.

The square root of 1323142221 is about 36375.0219381377. The cubic root of 1323142221 is about 1097.8310487189.

Adding to 1323142221 its reverse (1222413231), we get a palindrome (2545555452).

The spelling of 1323142221 in words is "one billion, three hundred twenty-three million, one hundred forty-two thousand, two hundred twenty-one".