3121220313 has 48 divisors (see below), whose sum is σ = 4777194240. Its totient is φ = 1959800832.

The previous prime is 3121220303. The next prime is 3121220327. The reversal of 3121220313 is 3130221213.

It is not a de Polignac number, because 3121220313 - 2⁸ = 3121220057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3121220303) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7208145 + ... + 7208577.

It is an arithmetic number, because the mean of its divisors is an integer number (99524880).

Almost surely, 2^3121220313 is an apocalyptic number.

It is an amenable number.

3121220313 is a deficient number, since it is larger than the sum of its proper divisors (1655973927).

3121220313 is a wasteful number, since it uses less digits than its factorization.

3121220313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 918 (or 915 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 3121220313 is about 55867.8826607918. The cubic root of 3121220313 is about 1461.4191981424.

Adding to 3121220313 its reverse (3130221213), we get a palindrome (6251441526).

The spelling of 3121220313 in words is "three billion, one hundred twenty-one million, two hundred twenty thousand, three hundred thirteen".