3121344021 has 16 divisors (see below), whose sum is σ = 4199284800. Its totient is φ = 2062201728.

The previous prime is 3121343989. The next prime is 3121344047. The reversal of 3121344021 is 1204431213.

It is not a de Polignac number, because 3121344021 - 2⁵ = 3121343989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3121344221) 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, 248275 + ... + 260543.

It is an arithmetic number, because the mean of its divisors is an integer number (262455300).

Almost surely, 2^3121344021 is an apocalyptic number.

It is an amenable number.

3121344021 is a deficient number, since it is larger than the sum of its proper divisors (1077940779).

3121344021 is a wasteful number, since it uses less digits than its factorization.

3121344021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13028.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 3121344021 is about 55868.9897975612. The cubic root of 3121344021 is about 1461.4385054261.

Adding to 3121344021 its reverse (1204431213), we get a palindrome (4325775234).

The spelling of 3121344021 in words is "three billion, one hundred twenty-one million, three hundred forty-four thousand, twenty-one".