3121211313 has 28 divisors (see below), whose sum is σ = 5105114448. Its totient is φ = 1891638360.

The previous prime is 3121211243. The next prime is 3121211341. The reversal of 3121211313 is 3131121213.

It is not a de Polignac number, because 3121211313 - 2¹⁴ = 3121194929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3121211363) 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 27 ways as a sum of consecutive naturals, for example, 186595 + ... + 202632.

It is an arithmetic number, because the mean of its divisors is an integer number (182325516).

Almost surely, 2^3121211313 is an apocalyptic number.

3121211313 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

It is an amenable number.

3121211313 is a deficient number, since it is larger than the sum of its proper divisors (1983903135).

3121211313 is an equidigital number, since it uses as much as digits as its factorization.

3121211313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389256 (or 389241 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 3121211313 is about 55867.8021135609. The cubic root of 3121211313 is about 1461.4177934797.

Adding to 3121211313 its reverse (3131121213), we get a palindrome (6252332526).

The spelling of 3121211313 in words is "three billion, one hundred twenty-one million, two hundred eleven thousand, three hundred thirteen".