1311223211213 has 4 divisors (see below), whose sum is σ = 1315889486268. Its totient is φ = 1306556936160.

The previous prime is 1311223211209. The next prime is 1311223211269. The reversal of 1311223211213 is 3121123221131.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 742702687204 + 568520524009 = 861802^2 + 754003^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311223211213 - 2² = 1311223211209 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311223211273) 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, 2333137106 + ... + 2333137667.

It is an arithmetic number, because the mean of its divisors is an integer number (328972371567).

Almost surely, 2^{1311223211213} is an apocalyptic number.

It is an amenable number.

1311223211213 is a deficient number, since it is larger than the sum of its proper divisors (4666275055).

1311223211213 is an equidigital number, since it uses as much as digits as its factorization.

1311223211213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4666275054.

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

Adding to 1311223211213 its reverse (3121123221131), we get a palindrome (4432346432344).

The spelling of 1311223211213 in words is "one trillion, three hundred eleven billion, two hundred twenty-three million, two hundred eleven thousand, two hundred thirteen".