3031321310021 has 4 divisors (see below), whose sum is σ = 3031338602700. Its totient is φ = 3031304017344.

The previous prime is 3031321310011. The next prime is 3031321310023. The reversal of 3031321310021 is 1200131231303.

3031321310021 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2161373365921 + 869947944100 = 1470161^2 + 932710^2 .

It is a cyclic number.

It is not a de Polignac number, because 3031321310021 - 2¹⁰ = 3031321308997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3031321309975 and 3031321310002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3031321310023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8380676 + ... + 8734893.

It is an arithmetic number, because the mean of its divisors is an integer number (757834650675).

Almost surely, 2^{3031321310021} is an apocalyptic number.

It is an amenable number.

3031321310021 is a deficient number, since it is larger than the sum of its proper divisors (17292679).

3031321310021 is a wasteful number, since it uses less digits than its factorization.

3031321310021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17292678.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 3031321310021 its reverse (1200131231303), we get a palindrome (4231452541324).

The spelling of 3031321310021 in words is "three trillion, thirty-one billion, three hundred twenty-one million, three hundred ten thousand, twenty-one".