1321313123003 has 4 divisors (see below), whose sum is σ = 1321630826880. Its totient is φ = 1320995419128.

The previous prime is 1321313122937. The next prime is 1321313123017. The reversal of 1321313123003 is 3003213131231.

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 1321313123003 - 2¹⁰ = 1321313121979 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1321313123003.

It is not an unprimeable number, because it can be changed into a prime (1321313123023) 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, 158845700 + ... + 158854017.

It is an arithmetic number, because the mean of its divisors is an integer number (330407706720).

Almost surely, 2^{1321313123003} is an apocalyptic number.

1321313123003 is a deficient number, since it is larger than the sum of its proper divisors (317703877).

1321313123003 is an equidigital number, since it uses as much as digits as its factorization.

1321313123003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317703876.

The product of its (nonzero) digits is 972, while the sum is 23.

Adding to 1321313123003 its reverse (3003213131231), we get a palindrome (4324526254234).

The spelling of 1321313123003 in words is "one trillion, three hundred twenty-one billion, three hundred thirteen million, one hundred twenty-three thousand, three".