1321244321 has 4 divisors (see below), whose sum is σ = 1366804500. Its totient is φ = 1275684144.

The previous prime is 1321244299. The next prime is 1321244357. The reversal of 1321244321 is 1234421231.

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

It can be written as a sum of positive squares in 2 ways, for example, as 752898721 + 568345600 = 27439^2 + 23840^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321244321 - 2²⁶ = 1254135457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321244371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22780046 + ... + 22780103.

It is an arithmetic number, because the mean of its divisors is an integer number (341701125).

Almost surely, 2^1321244321 is an apocalyptic number.

It is an amenable number.

1321244321 is a deficient number, since it is larger than the sum of its proper divisors (45560179).

1321244321 is an equidigital number, since it uses as much as digits as its factorization.

1321244321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45560178.

The product of its digits is 1152, while the sum is 23.

The square root of 1321244321 is about 36348.9246195813. The cubic root of 1321244321 is about 1097.3058921316.

Adding to 1321244321 its reverse (1234421231), we get a palindrome (2555665552).

The spelling of 1321244321 in words is "one billion, three hundred twenty-one million, two hundred forty-four thousand, three hundred twenty-one".