321221 has 2 divisors, whose sum is σ = 321222. Its totient is φ = 321220.

The previous prime is 321203. The next prime is 321227. The reversal of 321221 is 122123.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 172225 + 148996 = 415^2 + 386^2 .

It is a cyclic number.

It is not a de Polignac number, because 321221 - 2¹⁸ = 59077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160610 + 160611.

It is an arithmetic number, because the mean of its divisors is an integer number (160611).

2³²¹²²¹ is an apocalyptic number.

It is an amenable number.

321221 is a deficient number, since it is larger than the sum of its proper divisors (1).

321221 is an equidigital number, since it uses as much as digits as its factorization.

321221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24, while the sum is 11.

The square root of 321221 is about 566.7636191571. The cubic root of 321221 is about 68.4859224805.

Adding to 321221 its reverse (122123), we get a palindrome (443344).

It can be divided in two parts, 32122 and 1, that added together give a palindrome (32123).

The spelling of 321221 in words is "three hundred twenty-one thousand, two hundred twenty-one", and thus it is an iban number.