321020313 has 16 divisors (see below), whose sum is σ = 432783360. Its totient is φ = 211646736.

The previous prime is 321020303. The next prime is 321020317. The reversal of 321020313 is 313020123.

It is not a de Polignac number, because 321020313 - 2⁵ = 321020281 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 321020292 and 321020301.

It is not an unprimeable number, because it can be changed into a prime (321020317) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135606 + ... + 137952.

It is an arithmetic number, because the mean of its divisors is an integer number (27048960).

Almost surely, 2^321020313 is an apocalyptic number.

It is an amenable number.

321020313 is a deficient number, since it is larger than the sum of its proper divisors (111763047).

321020313 is a wasteful number, since it uses less digits than its factorization.

321020313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2836.

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 321020313 is about 17917.0397387515. The cubic root of 321020313 is about 684.7165701881.

Adding to 321020313 its reverse (313020123), we get a palindrome (634040436).

The spelling of 321020313 in words is "three hundred twenty-one million, twenty thousand, three hundred thirteen".