3121321313321 has 4 divisors (see below), whose sum is σ = 3121459209600. Its totient is φ = 3121183417044.

The previous prime is 3121321313317. The next prime is 3121321313339. The reversal of 3121321313321 is 1233131231213.

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 3121321313321 - 2² = 3121321313317 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3121321313351) 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, 68914181 + ... + 68959458.

It is an arithmetic number, because the mean of its divisors is an integer number (780364802400).

Almost surely, 2^{3121321313321} is an apocalyptic number.

It is an amenable number.

3121321313321 is a deficient number, since it is larger than the sum of its proper divisors (137896279).

3121321313321 is a wasteful number, since it uses less digits than its factorization.

3121321313321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137896278.

The product of its digits is 1944, while the sum is 26.

Adding to 3121321313321 its reverse (1233131231213), we get a palindrome (4354452544534).

The spelling of 3121321313321 in words is "three trillion, one hundred twenty-one billion, three hundred twenty-one million, three hundred thirteen thousand, three hundred twenty-one".