1321320143023 has 4 divisors (see below), whose sum is σ = 1333442346280. Its totient is φ = 1309197939768.

The previous prime is 1321320142997. The next prime is 1321320143053. The reversal of 1321320143023 is 3203410231231.

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 1321320143023 - 2²⁵ = 1321286588591 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 (1321320143053) 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, 6061101465 + ... + 6061101682.

It is an arithmetic number, because the mean of its divisors is an integer number (333360586570).

Almost surely, 2^{1321320143023} is an apocalyptic number.

1321320143023 is a deficient number, since it is larger than the sum of its proper divisors (12122203257).

1321320143023 is a wasteful number, since it uses less digits than its factorization.

1321320143023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12122203256.

The product of its (nonzero) digits is 2592, while the sum is 25.

Adding to 1321320143023 its reverse (3203410231231), we get a palindrome (4524730374254).

The spelling of 1321320143023 in words is "one trillion, three hundred twenty-one billion, three hundred twenty million, one hundred forty-three thousand, twenty-three".