1321443241 has 4 divisors (see below), whose sum is σ = 1328361984. Its totient is φ = 1314524500.

The previous prime is 1321443209. The next prime is 1321443251. The reversal of 1321443241 is 1423441231.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1423441231 = 3607 ⋅394633.

It is a cyclic number.

It is not a de Polignac number, because 1321443241 - 2⁵ = 1321443209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321443251) 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, 3459085 + ... + 3459466.

It is an arithmetic number, because the mean of its divisors is an integer number (332090496).

Almost surely, 2^1321443241 is an apocalyptic number.

It is an amenable number.

1321443241 is a deficient number, since it is larger than the sum of its proper divisors (6918743).

1321443241 is an equidigital number, since it uses as much as digits as its factorization.

1321443241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6918742.

The product of its digits is 2304, while the sum is 25.

The square root of 1321443241 is about 36351.6607736153. The cubic root of 1321443241 is about 1097.3609576814.

Adding to 1321443241 its reverse (1423441231), we get a palindrome (2744884472).

The spelling of 1321443241 in words is "one billion, three hundred twenty-one million, four hundred forty-three thousand, two hundred forty-one".