3221212302221 has 2 divisors, whose sum is σ = 3221212302222. Its totient is φ = 3221212302220.

The previous prime is 3221212302173. The next prime is 3221212302247. The reversal of 3221212302221 is 1222032121223.

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., 2972072560900 + 249139741321 = 1723970^2 + 499139^2 .

It is a cyclic number.

It is not a de Polignac number, because 3221212302221 - 2⁶ = 3221212302157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3221212302281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1610606151110 + 1610606151111.

It is an arithmetic number, because the mean of its divisors is an integer number (1610606151111).

Almost surely, 2^{3221212302221} is an apocalyptic number.

It is an amenable number.

3221212302221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3221212302221 is an equidigital number, since it uses as much as digits as its factorization.

3221212302221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 3221212302221 its reverse (1222032121223), we get a palindrome (4443244423444).

The spelling of 3221212302221 in words is "three trillion, two hundred twenty-one billion, two hundred twelve million, three hundred two thousand, two hundred twenty-one".