1311221323023 has 32 divisors (see below), whose sum is σ = 1807961554944. Its totient is φ = 844417980000.

The previous prime is 1311221322979. The next prime is 1311221323079. The reversal of 1311221323023 is 3203231221131.

It is not a de Polignac number, because 1311221323023 - 2⁹ = 1311221322511 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1311221322984 and 1311221323002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311221323823) 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 31 ways as a sum of consecutive naturals, for example, 132830778 + ... + 132840648.

It is an arithmetic number, because the mean of its divisors is an integer number (56498798592).

Almost surely, 2^{1311221323023} is an apocalyptic number.

1311221323023 is a deficient number, since it is larger than the sum of its proper divisors (496740231921).

1311221323023 is a wasteful number, since it uses less digits than its factorization.

1311221323023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12347.

The product of its (nonzero) digits is 1296, while the sum is 24.

Adding to 1311221323023 its reverse (3203231221131), we get a palindrome (4514452544154).

The spelling of 1311221323023 in words is "one trillion, three hundred eleven billion, two hundred twenty-one million, three hundred twenty-three thousand, twenty-three".