220302221 has 2 divisors, whose sum is σ = 220302222. Its totient is φ = 220302220.

The previous prime is 220302217. The next prime is 220302227. The reversal of 220302221 is 122203022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 219928900 + 373321 = 14830^2 + 611^2 .

It is a cyclic number.

It is not a de Polignac number, because 220302221 - 2² = 220302217 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 220302196 and 220302205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220302227) 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, 110151110 + 110151111.

It is an arithmetic number, because the mean of its divisors is an integer number (110151111).

Almost surely, 2^220302221 is an apocalyptic number.

It is an amenable number.

220302221 is a deficient number, since it is larger than the sum of its proper divisors (1).

220302221 is an equidigital number, since it uses as much as digits as its factorization.

220302221 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 14.

The square root of 220302221 is about 14842.5813455746. The cubic root of 220302221 is about 603.9573791615.

Adding to 220302221 its reverse (122203022), we get a palindrome (342505243).

The spelling of 220302221 in words is "two hundred twenty million, three hundred two thousand, two hundred twenty-one".