1321213302443 has 4 divisors (see below), whose sum is σ = 1340932904040. Its totient is φ = 1301493700848.

The previous prime is 1321213302433. The next prime is 1321213302511. The reversal of 1321213302443 is 3442033121231.

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

It is a cyclic number.

It is not a de Polignac number, because 1321213302443 - 2²⁶ = 1321146193579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321213302433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9859800698 + ... + 9859800831.

It is an arithmetic number, because the mean of its divisors is an integer number (335233226010).

Almost surely, 2^{1321213302443} is an apocalyptic number.

1321213302443 is a deficient number, since it is larger than the sum of its proper divisors (19719601597).

1321213302443 is an equidigital number, since it uses as much as digits as its factorization.

1321213302443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19719601596.

The product of its (nonzero) digits is 10368, while the sum is 29.

Adding to 1321213302443 its reverse (3442033121231), we get a palindrome (4763246423674).

The spelling of 1321213302443 in words is "one trillion, three hundred twenty-one billion, two hundred thirteen million, three hundred two thousand, four hundred forty-three".