1321203103009 has 4 divisors (see below), whose sum is σ = 1326226689216. Its totient is φ = 1316179516804.

The previous prime is 1321203102991. The next prime is 1321203103019. The reversal of 1321203103009 is 9003013021231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1321203103009 - 2⁵ = 1321203102977 is a prime.

It is a super-2 number, since 2×1321203103009² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321203103019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2511792709 + ... + 2511793234.

It is an arithmetic number, because the mean of its divisors is an integer number (331556672304).

Almost surely, 2^{1321203103009} is an apocalyptic number.

It is an amenable number.

1321203103009 is a deficient number, since it is larger than the sum of its proper divisors (5023586207).

1321203103009 is an equidigital number, since it uses as much as digits as its factorization.

1321203103009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5023586206.

The product of its (nonzero) digits is 972, while the sum is 25.

The spelling of 1321203103009 in words is "one trillion, three hundred twenty-one billion, two hundred three million, one hundred three thousand, nine".