323220221 has 4 divisors (see below), whose sum is σ = 323264832. Its totient is φ = 323175612.

The previous prime is 323220137. The next prime is 323220223. The reversal of 323220221 is 122022323.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 122022323 = 1789 ⋅68207.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-323220221 is a prime.

It is a super-2 number, since 2×323220221² = 208942622526577682, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 323220221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (323220223) 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, 8651 + ... + 26856.

It is an arithmetic number, because the mean of its divisors is an integer number (80816208).

Almost surely, 2^323220221 is an apocalyptic number.

It is an amenable number.

323220221 is a deficient number, since it is larger than the sum of its proper divisors (44611).

323220221 is an equidigital number, since it uses as much as digits as its factorization.

323220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44610.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 323220221 is about 17978.3264237804. The cubic root of 323220221 is about 686.2771003550.

Adding to 323220221 its reverse (122022323), we get a palindrome (445242544).

The spelling of 323220221 in words is "three hundred twenty-three million, two hundred twenty thousand, two hundred twenty-one".