321220223 has 2 divisors, whose sum is σ = 321220224. Its totient is φ = 321220222.

The previous prime is 321220217. The next prime is 321220247. The reversal of 321220223 is 322022123.

It is a weak prime.

It is an emirp because it is prime and its reverse (322022123) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 321220223 - 2⁸ = 321219967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321220723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160610111 + 160610112.

It is an arithmetic number, because the mean of its divisors is an integer number (160610112).

Almost surely, 2^321220223 is an apocalyptic number.

321220223 is a deficient number, since it is larger than the sum of its proper divisors (1).

321220223 is an equidigital number, since it uses as much as digits as its factorization.

321220223 is an evil number, because the sum of its binary digits is even.

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

The square root of 321220223 is about 17922.6176380572. The cubic root of 321220223 is about 684.8586726037.

Adding to 321220223 its reverse (322022123), we get a palindrome (643242346).

The spelling of 321220223 in words is "three hundred twenty-one million, two hundred twenty thousand, two hundred twenty-three".