220202221 has 2 divisors, whose sum is σ = 220202222. Its totient is φ = 220202220.

The previous prime is 220202201. The next prime is 220202233. The reversal of 220202221 is 122202022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139004100 + 81198121 = 11790^2 + 9011^2 .

It is a cyclic number.

It is not a de Polignac number, because 220202221 - 2⁵ = 220202189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220202201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110101110 + 110101111.

It is an arithmetic number, because the mean of its divisors is an integer number (110101111).

Almost surely, 2^220202221 is an apocalyptic number.

It is an amenable number.

220202221 is a deficient number, since it is larger than the sum of its proper divisors (1).

220202221 is an equidigital number, since it uses as much as digits as its factorization.

220202221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 220202221 is about 14839.2122769371. The cubic root of 220202221 is about 603.8659821732.

Adding to 220202221 its reverse (122202022), we get a palindrome (342404243).

The spelling of 220202221 in words is "two hundred twenty million, two hundred two thousand, two hundred twenty-one".