220017221 has 2 divisors, whose sum is σ = 220017222. Its totient is φ = 220017220.

The previous prime is 220017211. The next prime is 220017271. The reversal of 220017221 is 122710022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 192820996 + 27196225 = 13886^2 + 5215^2 .

It is a cyclic number.

It is not a de Polignac number, because 220017221 - 2⁶ = 220017157 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 220017221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220017211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110008610 + 110008611.

It is an arithmetic number, because the mean of its divisors is an integer number (110008611).

Almost surely, 2^220017221 is an apocalyptic number.

It is an amenable number.

220017221 is a deficient number, since it is larger than the sum of its proper divisors (1).

220017221 is an equidigital number, since it uses as much as digits as its factorization.

220017221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 220017221 is about 14832.9774826230. The cubic root of 220017221 is about 603.6968247715.

Adding to 220017221 its reverse (122710022), we get a palindrome (342727243).

The spelling of 220017221 in words is "two hundred twenty million, seventeen thousand, two hundred twenty-one".