3221220161 has 2 divisors, whose sum is σ = 3221220162. Its totient is φ = 3221220160.

The previous prime is 3221220083. The next prime is 3221220209. The reversal of 3221220161 is 1610221223.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3161250625 + 59969536 = 56225^2 + 7744^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3221220161 is a prime.

It is not a weakly prime, because it can be changed into another prime (3221222161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1610610080 + 1610610081.

It is an arithmetic number, because the mean of its divisors is an integer number (1610610081).

Almost surely, 2^3221220161 is an apocalyptic number.

It is an amenable number.

3221220161 is a deficient number, since it is larger than the sum of its proper divisors (1).

3221220161 is an equidigital number, since it uses as much as digits as its factorization.

3221220161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 3221220161 is about 56755.7940742617. The cubic root of 3221220161 is about 1476.8627483341.

Adding to 3221220161 its reverse (1610221223), we get a palindrome (4831441384).

The spelling of 3221220161 in words is "three billion, two hundred twenty-one million, two hundred twenty thousand, one hundred sixty-one".