321344021 has 4 divisors (see below), whose sum is σ = 322747500. Its totient is φ = 319940544.

The previous prime is 321344011. The next prime is 321344033. The reversal of 321344021 is 120443123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120443123 = 2927 ⋅41149.

It can be written as a sum of positive squares in 2 ways, for example, as 134884996 + 186459025 = 11614^2 + 13655^2 .

It is a cyclic number.

It is not a de Polignac number, because 321344021 - 2¹⁴ = 321327637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 321343984 and 321344002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321344011) 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 3 ways as a sum of consecutive naturals, for example, 701396 + ... + 701853.

It is an arithmetic number, because the mean of its divisors is an integer number (80686875).

Almost surely, 2^321344021 is an apocalyptic number.

It is an amenable number.

321344021 is a deficient number, since it is larger than the sum of its proper divisors (1403479).

321344021 is a wasteful number, since it uses less digits than its factorization.

321344021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1403478.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 321344021 is about 17926.0709861364. The cubic root of 321344021 is about 684.9466426196.

Adding to 321344021 its reverse (120443123), we get a palindrome (441787144).

The spelling of 321344021 in words is "three hundred twenty-one million, three hundred forty-four thousand, twenty-one".