1321001320103 has 4 divisors (see below), whose sum is σ = 1322746368840. Its totient is φ = 1319256271368.

The previous prime is 1321001320099. The next prime is 1321001320181. The reversal of 1321001320103 is 3010231001231.

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 1321001320103 - 2² = 1321001320099 is a prime.

It is a super-4 number, since 4×1321001320103⁴ (a number of 50 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321001320603) 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, 872523233 + ... + 872524746.

It is an arithmetic number, because the mean of its divisors is an integer number (330686592210).

Almost surely, 2^{1321001320103} is an apocalyptic number.

1321001320103 is a deficient number, since it is larger than the sum of its proper divisors (1745048737).

1321001320103 is an equidigital number, since it uses as much as digits as its factorization.

1321001320103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1745048736.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 1321001320103 its reverse (3010231001231), we get a palindrome (4331232321334).

The spelling of 1321001320103 in words is "one trillion, three hundred twenty-one billion, one million, three hundred twenty thousand, one hundred three".