3121320321 has 12 divisors (see below), whose sum is σ = 5152655872. Its totient is φ = 1783611576.

The previous prime is 3121320287. The next prime is 3121320329. The reversal of 3121320321 is 1230231213.

3121320321 is a `hidden beast` number, since 3 + 1 + 21 + 320 + 321 = 666.

It is not a de Polignac number, because 3121320321 - 2⁷ = 3121320193 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3121320294 and 3121320303.

It is not an unprimeable number, because it can be changed into a prime (3121320329) 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 11 ways as a sum of consecutive naturals, for example, 24772321 + ... + 24772446.

Almost surely, 2^3121320321 is an apocalyptic number.

It is an amenable number.

3121320321 is a deficient number, since it is larger than the sum of its proper divisors (2031335551).

3121320321 is a wasteful number, since it uses less digits than its factorization.

3121320321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49544780 (or 49544777 counting only the distinct ones).

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

The square root of 3121320321 is about 55868.7776938068. Note that the first 3 decimals coincide. The cubic root of 3121320321 is about 1461.4348065728.

Adding to 3121320321 its reverse (1230231213), we get a palindrome (4351551534).

The spelling of 3121320321 in words is "three billion, one hundred twenty-one million, three hundred twenty thousand, three hundred twenty-one".