1321003011331 has 4 divisors (see below), whose sum is σ = 1342658798464. Its totient is φ = 1299347224200.

The previous prime is 1321003011329. The next prime is 1321003011371. The reversal of 1321003011331 is 1331103001231.

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 1321003011331 - 2¹ = 1321003011329 is a prime.

It is a super-3 number, since 3×1321003011331³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1321003011299 and 1321003011308.

It is not an unprimeable number, because it can be changed into a prime (1321003011371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10827893475 + ... + 10827893596.

It is an arithmetic number, because the mean of its divisors is an integer number (335664699616).

Almost surely, 2^{1321003011331} is an apocalyptic number.

1321003011331 is a deficient number, since it is larger than the sum of its proper divisors (21655787133).

1321003011331 is an equidigital number, since it uses as much as digits as its factorization.

1321003011331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21655787132.

The product of its (nonzero) digits is 162, while the sum is 19.

Adding to 1321003011331 its reverse (1331103001231), we get a palindrome (2652106012562).

The spelling of 1321003011331 in words is "one trillion, three hundred twenty-one billion, three million, eleven thousand, three hundred thirty-one".