323213321 has 4 divisors (see below), whose sum is σ = 323249412. Its totient is φ = 323177232.

The previous prime is 323213309. The next prime is 323213357. The reversal of 323213321 is 123312323.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 123312323 = 479 ⋅257437.

It can be written as a sum of positive squares in 2 ways, for example, as 53071225 + 270142096 = 7285^2 + 16436^2 .

It is a cyclic number.

It is not a de Polignac number, because 323213321 - 2⁶ = 323213257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 323213293 and 323213302.

It is not an unprimeable number, because it can be changed into a prime (323213221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6695 + ... + 26291.

It is an arithmetic number, because the mean of its divisors is an integer number (80812353).

Almost surely, 2^323213321 is an apocalyptic number.

It is an amenable number.

323213321 is a deficient number, since it is larger than the sum of its proper divisors (36091).

323213321 is a wasteful number, since it uses less digits than its factorization.

323213321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36090.

The product of its digits is 648, while the sum is 20.

The square root of 323213321 is about 17978.1345250279. The cubic root of 323213321 is about 686.2722168469.

Adding to 323213321 its reverse (123312323), we get a palindrome (446525644).

The spelling of 323213321 in words is "three hundred twenty-three million, two hundred thirteen thousand, three hundred twenty-one".