31230210321 has 12 divisors (see below), whose sum is σ = 45849817780. Its totient is φ = 20478826080.

The previous prime is 31230210289. The next prime is 31230210337. The reversal of 31230210321 is 12301203213.

31230210321 is a `hidden beast` number, since 31 + 2 + 302 + 10 + 321 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 14336709696 + 16893500625 = 119736^2 + 129975^2 .

It is not a de Polignac number, because 31230210321 - 2⁵ = 31230210289 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31230210294 and 31230210303.

It is not an unprimeable number, because it can be changed into a prime (31230210391) 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 11 ways as a sum of consecutive naturals, for example, 28442266 + ... + 28443363.

Almost surely, 2^31230210321 is an apocalyptic number.

It is an amenable number.

31230210321 is a deficient number, since it is larger than the sum of its proper divisors (14619607459).

31230210321 is a wasteful number, since it uses less digits than its factorization.

31230210321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56885696 (or 56885693 counting only the distinct ones).

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

Adding to 31230210321 its reverse (12301203213), we get a palindrome (43531413534).

The spelling of 31230210321 in words is "thirty-one billion, two hundred thirty million, two hundred ten thousand, three hundred twenty-one".