422120221 has 2 divisors, whose sum is σ = 422120222. Its totient is φ = 422120220.

The previous prime is 422120203. The next prime is 422120227. The reversal of 422120221 is 122021224.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 218744100 + 203376121 = 14790^2 + 14261^2 .

It is a cyclic number.

It is not a de Polignac number, because 422120221 - 2⁵ = 422120189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 422120195 and 422120204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (422120227) 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, 211060110 + 211060111.

It is an arithmetic number, because the mean of its divisors is an integer number (211060111).

Almost surely, 2^422120221 is an apocalyptic number.

It is an amenable number.

422120221 is a deficient number, since it is larger than the sum of its proper divisors (1).

422120221 is an equidigital number, since it uses as much as digits as its factorization.

422120221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 422120221 is about 20545.5645091587. The cubic root of 422120221 is about 750.1452880015.

Adding to 422120221 its reverse (122021224), we get a palindrome (544141445).

It can be divided in two parts, 4221 and 20221, that added together give a palindrome (24442).

The spelling of 422120221 in words is "four hundred twenty-two million, one hundred twenty thousand, two hundred twenty-one".