3220211221 has 2 divisors, whose sum is σ = 3220211222. Its totient is φ = 3220211220.

The previous prime is 3220211201. The next prime is 3220211237. The reversal of 3220211221 is 1221120223.

It is a happy number.

It is an a-pointer prime, because the next prime (3220211237) can be obtained adding 3220211221 to its sum of digits (16).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1842984900 + 1377226321 = 42930^2 + 37111^2 .

It is a cyclic number.

It is not a de Polignac number, because 3220211221 - 2⁹ = 3220210709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3220211195 and 3220211204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3220211201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1610105610 + 1610105611.

It is an arithmetic number, because the mean of its divisors is an integer number (1610105611).

Almost surely, 2^3220211221 is an apocalyptic number.

It is an amenable number.

3220211221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3220211221 is an equidigital number, since it uses as much as digits as its factorization.

3220211221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 3220211221 is about 56746.9049464374. The cubic root of 3220211221 is about 1476.7085395327.

Adding to 3220211221 its reverse (1221120223), we get a palindrome (4441331444).

The spelling of 3220211221 in words is "three billion, two hundred twenty million, two hundred eleven thousand, two hundred twenty-one".