220442221 has 2 divisors, whose sum is σ = 220442222. Its totient is φ = 220442220.

The previous prime is 220442203. The next prime is 220442239. The reversal of 220442221 is 122244022.

It is a balanced prime because it is at equal distance from previous prime (220442203) and next prime (220442239).

It can be written as a sum of positive squares in only one way, i.e., 217238121 + 3204100 = 14739^2 + 1790^2 .

It is a cyclic number.

It is not a de Polignac number, because 220442221 - 2⁷ = 220442093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220442251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110221110 + 110221111.

It is an arithmetic number, because the mean of its divisors is an integer number (110221111).

Almost surely, 2^220442221 is an apocalyptic number.

It is an amenable number.

220442221 is a deficient number, since it is larger than the sum of its proper divisors (1).

220442221 is an equidigital number, since it uses as much as digits as its factorization.

220442221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 220442221 is about 14847.2967573225. The cubic root of 220442221 is about 604.0852884912.

Adding to 220442221 its reverse (122244022), we get a palindrome (342686243).

The spelling of 220442221 in words is "two hundred twenty million, four hundred forty-two thousand, two hundred twenty-one".