1311223321211 has 4 divisors (see below), whose sum is σ = 1311231414624. Its totient is φ = 1311215227800.

The previous prime is 1311223321181. The next prime is 1311223321339. The reversal of 1311223321211 is 1121233221131.

It is a happy number.

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 1311223321211 - 2³⁴ = 1294043452027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311223323211) 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, 3798620 + ... + 4129401.

It is an arithmetic number, because the mean of its divisors is an integer number (327807853656).

Almost surely, 2^{1311223321211} is an apocalyptic number.

1311223321211 is a deficient number, since it is larger than the sum of its proper divisors (8093413).

1311223321211 is an equidigital number, since it uses as much as digits as its factorization.

1311223321211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8093412.

The product of its digits is 432, while the sum is 23.

Adding to 1311223321211 its reverse (1121233221131), we get a palindrome (2432456542342).

The spelling of 1311223321211 in words is "one trillion, three hundred eleven billion, two hundred twenty-three million, three hundred twenty-one thousand, two hundred eleven".