1321103011321 has 4 divisors (see below), whose sum is σ = 1321946090752. Its totient is φ = 1320259931892.

The previous prime is 1321103011313. The next prime is 1321103011351. The reversal of 1321103011321 is 1231103011231.

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 1321103011321 - 2³ = 1321103011313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321103011351) 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, 421537365 + ... + 421540498.

It is an arithmetic number, because the mean of its divisors is an integer number (330486522688).

Almost surely, 2^{1321103011321} is an apocalyptic number.

It is an amenable number.

1321103011321 is a deficient number, since it is larger than the sum of its proper divisors (843079431).

1321103011321 is an equidigital number, since it uses as much as digits as its factorization.

1321103011321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843079430.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 1321103011321 its reverse (1231103011231), we get a palindrome (2552206022552).

The spelling of 1321103011321 in words is "one trillion, three hundred twenty-one billion, one hundred three million, eleven thousand, three hundred twenty-one".