1321131013203 has 4 divisors (see below), whose sum is σ = 1761508017608. Its totient is φ = 880754008800.

The previous prime is 1321131013133. The next prime is 1321131013207. The reversal of 1321131013203 is 3023101311231.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1321131013203 - 2⁸ = 1321131012947 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 1321131013203.

It is not an unprimeable number, because it can be changed into a prime (1321131013207) 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, 220188502198 + ... + 220188502203.

It is an arithmetic number, because the mean of its divisors is an integer number (440377004402).

Almost surely, 2^{1321131013203} is an apocalyptic number.

1321131013203 is a deficient number, since it is larger than the sum of its proper divisors (440377004405).

1321131013203 is an equidigital number, since it uses as much as digits as its factorization.

1321131013203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440377004404.

The product of its (nonzero) digits is 324, while the sum is 21.

Adding to 1321131013203 its reverse (3023101311231), we get a palindrome (4344232324434).

The spelling of 1321131013203 in words is "one trillion, three hundred twenty-one billion, one hundred thirty-one million, thirteen thousand, two hundred three".