321213332221 has 2 divisors, whose sum is σ = 321213332222. Its totient is φ = 321213332220.

The previous prime is 321213332203. The next prime is 321213332227. The reversal of 321213332221 is 122233312123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 310059648900 + 11153683321 = 556830^2 + 105611^2 .

It is a cyclic number.

It is not a de Polignac number, because 321213332221 - 2⁹ = 321213331709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321213332227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160606666110 + 160606666111.

It is an arithmetic number, because the mean of its divisors is an integer number (160606666111).

Almost surely, 2^321213332221 is an apocalyptic number.

It is an amenable number.

321213332221 is a deficient number, since it is larger than the sum of its proper divisors (1).

321213332221 is an equidigital number, since it uses as much as digits as its factorization.

321213332221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 25.

Adding to 321213332221 its reverse (122233312123), we get a palindrome (443446644344).

The spelling of 321213332221 in words is "three hundred twenty-one billion, two hundred thirteen million, three hundred thirty-two thousand, two hundred twenty-one".