1311043321403 has 4 divisors (see below), whose sum is σ = 1329508720368. Its totient is φ = 1292577922440.

The previous prime is 1311043321363. The next prime is 1311043321429. The reversal of 1311043321403 is 3041233401131.

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 1311043321403 - 2¹² = 1311043317307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311043371403) 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 3 ways as a sum of consecutive naturals, for example, 9232699376 + ... + 9232699517.

It is an arithmetic number, because the mean of its divisors is an integer number (332377180092).

Almost surely, 2^{1311043321403} is an apocalyptic number.

1311043321403 is a deficient number, since it is larger than the sum of its proper divisors (18465398965).

1311043321403 is an equidigital number, since it uses as much as digits as its factorization.

1311043321403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18465398964.

The product of its (nonzero) digits is 2592, while the sum is 26.

Adding to 1311043321403 its reverse (3041233401131), we get a palindrome (4352276722534).

The spelling of 1311043321403 in words is "one trillion, three hundred eleven billion, forty-three million, three hundred twenty-one thousand, four hundred three".