3121033021313 has 4 divisors (see below), whose sum is σ = 3124834523988. Its totient is φ = 3117231518640.

The previous prime is 3121033021261. The next prime is 3121033021331. The reversal of 3121033021313 is 3131203301213.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1368565400449 + 1752467620864 = 1169857^2 + 1323808^2 .

It is a cyclic number.

It is not a de Polignac number, because 3121033021313 - 2²² = 3121028827009 is a prime.

It is a super-2 number, since 2×3121033021313² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3121033027313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1900750106 + ... + 1900751747.

It is an arithmetic number, because the mean of its divisors is an integer number (781208630997).

Almost surely, 2^{3121033021313} is an apocalyptic number.

It is an amenable number.

3121033021313 is a deficient number, since it is larger than the sum of its proper divisors (3801502675).

3121033021313 is an equidigital number, since it uses as much as digits as its factorization.

3121033021313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3801502674.

The product of its (nonzero) digits is 972, while the sum is 23.

Adding to 3121033021313 its reverse (3131203301213), we get a palindrome (6252236322526).

The spelling of 3121033021313 in words is "three trillion, one hundred twenty-one billion, thirty-three million, twenty-one thousand, three hundred thirteen".