3121113021 has 16 divisors (see below), whose sum is σ = 4482610944. Its totient is φ = 1920250944.

The previous prime is 3121113001. The next prime is 3121113043. The reversal of 3121113021 is 1203111213.

It is a happy number.

It is not a de Polignac number, because 3121113021 - 2⁷ = 3121112893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3121113001) 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 15 ways as a sum of consecutive naturals, for example, 296175 + ... + 306531.

It is an arithmetic number, because the mean of its divisors is an integer number (280163184).

Almost surely, 2^3121113021 is an apocalyptic number.

It is an amenable number.

3121113021 is a deficient number, since it is larger than the sum of its proper divisors (1361497923).

3121113021 is a wasteful number, since it uses less digits than its factorization.

3121113021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18100.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 3121113021 is about 55866.9224228434. The cubic root of 3121113021 is about 1461.4024525142.

Adding to 3121113021 its reverse (1203111213), we get a palindrome (4324224234).

The spelling of 3121113021 in words is "three billion, one hundred twenty-one million, one hundred thirteen thousand, twenty-one".