3121021 has 4 divisors (see below), whose sum is σ = 3133152. Its totient is φ = 3108892.

The previous prime is 3121007. The next prime is 3121033. The reversal of 3121021 is 1201213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1201213 = 13 ⋅92401.

It is a cyclic number.

It is not a de Polignac number, because 3121021 - 2⁵ = 3120989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3120989 and 3121007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3121051) 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, 5671 + ... + 6196.

It is an arithmetic number, because the mean of its divisors is an integer number (783288).

Almost surely, 2^3121021 is an apocalyptic number.

It is an amenable number.

3121021 is a deficient number, since it is larger than the sum of its proper divisors (12131).

3121021 is a wasteful number, since it uses less digits than its factorization.

3121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12130.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 3121021 is about 1766.6411633379. The cubic root of 3121021 is about 146.1388090006.

Adding to 3121021 its reverse (1201213), we get a palindrome (4322234).

The spelling of 3121021 in words is "three million, one hundred twenty-one thousand, twenty-one".