3121021223 has 4 divisors (see below), whose sum is σ = 3123991848. Its totient is φ = 3118050600.

The previous prime is 3121021213. The next prime is 3121021237. The reversal of 3121021223 is 3221201213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3221201213 = 20743 ⋅155291.

It is a cyclic number.

It is not a de Polignac number, because 3121021223 - 2⁴ = 3121021207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3121021213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1483736 + ... + 1485837.

It is an arithmetic number, because the mean of its divisors is an integer number (780997962).

Almost surely, 2^3121021223 is an apocalyptic number.

3121021223 is a deficient number, since it is larger than the sum of its proper divisors (2970625).

3121021223 is a wasteful number, since it uses less digits than its factorization.

3121021223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2970624.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 3121021223 is about 55866.1008394178. The cubic root of 3121021223 is about 1461.3881248115.

Adding to 3121021223 its reverse (3221201213), we get a palindrome (6342222436).

The spelling of 3121021223 in words is "three billion, one hundred twenty-one million, twenty-one thousand, two hundred twenty-three".