1243313444321 has 16 divisors (see below), whose sum is σ = 1370808759936. Its totient is φ = 1120396910976.

The previous prime is 1243313444311. The next prime is 1243313444323. The reversal of 1243313444321 is 1234443133421.

It is a cyclic number.

It is not a de Polignac number, because 1243313444321 - 2¹⁰ = 1243313443297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1243313444323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 488036 + ... + 1650698.

It is an arithmetic number, because the mean of its divisors is an integer number (85675547496).

Almost surely, 2^{1243313444321} is an apocalyptic number.

It is an amenable number.

1243313444321 is a deficient number, since it is larger than the sum of its proper divisors (127495315615).

1243313444321 is a wasteful number, since it uses less digits than its factorization.

1243313444321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1164632.

The product of its digits is 82944, while the sum is 35.

Adding to 1243313444321 its reverse (1234443133421), we get a palindrome (2477756577742).

The spelling of 1243313444321 in words is "one trillion, two hundred forty-three billion, three hundred thirteen million, four hundred forty-four thousand, three hundred twenty-one".