1311223111023 has 24 divisors (see below), whose sum is σ = 2033855920512. Its totient is φ = 749225359344.

The previous prime is 1311223111019. The next prime is 1311223111061. The reversal of 1311223111023 is 3201113221131.

It is not a de Polignac number, because 1311223111023 - 2² = 1311223111019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311223111223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2270236 + ... + 2788622.

It is an arithmetic number, because the mean of its divisors is an integer number (84743996688).

Almost surely, 2^{1311223111023} is an apocalyptic number.

1311223111023 is a deficient number, since it is larger than the sum of its proper divisors (722632809489).

1311223111023 is a wasteful number, since it uses less digits than its factorization.

1311223111023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535611 (or 535604 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 1311223111023 its reverse (3201113221131), we get a palindrome (4512336332154).

The spelling of 1311223111023 in words is "one trillion, three hundred eleven billion, two hundred twenty-three million, one hundred eleven thousand, twenty-three".