321031000021 has 8 divisors (see below), whose sum is σ = 326395169280. Its totient is φ = 315683673888.

The previous prime is 321031000009. The next prime is 321031000039. The reversal of 321031000021 is 120000130123.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 321031000021 - 2³³ = 312441065429 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 321030999965 and 321031000010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321031000061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4172341 + ... + 4248586.

It is an arithmetic number, because the mean of its divisors is an integer number (40799396160).

Almost surely, 2^321031000021 is an apocalyptic number.

It is an amenable number.

321031000021 is a deficient number, since it is larger than the sum of its proper divisors (5364169259).

321031000021 is an equidigital number, since it uses as much as digits as its factorization.

321031000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8421563.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 321031000021 its reverse (120000130123), we get a palindrome (441031130144).

The spelling of 321031000021 in words is "three hundred twenty-one billion, thirty-one million, twenty-one", and thus it is an aban number.