1323431221 has 4 divisors (see below), whose sum is σ = 1512492832. Its totient is φ = 1134369612.

The previous prime is 1323431203. The next prime is 1323431227. The reversal of 1323431221 is 1221343231.

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 a cyclic number.

It is not a de Polignac number, because 1323431221 - 2⁵ = 1323431189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1323431192 and 1323431201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1323431227) 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, 94530795 + ... + 94530808.

It is an arithmetic number, because the mean of its divisors is an integer number (378123208).

Almost surely, 2^1323431221 is an apocalyptic number.

It is an amenable number.

1323431221 is a deficient number, since it is larger than the sum of its proper divisors (189061611).

1323431221 is an equidigital number, since it uses as much as digits as its factorization.

1323431221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189061610.

The product of its digits is 864, while the sum is 22.

The square root of 1323431221 is about 36378.9942274384. The cubic root of 1323431221 is about 1097.9109721193.

Adding to 1323431221 its reverse (1221343231), we get a palindrome (2544774452).

The spelling of 1323431221 in words is "one billion, three hundred twenty-three million, four hundred thirty-one thousand, two hundred twenty-one".