422201221 has 4 divisors (see below), whose sum is σ = 454678252. Its totient is φ = 389724192.

The previous prime is 422201209. The next prime is 422201243. The reversal of 422201221 is 122102224.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 182385025 + 239816196 = 13505^2 + 15486^2 .

It is not a de Polignac number, because 422201221 - 2⁵ = 422201189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 422201195 and 422201204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (422201281) 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 in 3 ways as a sum of consecutive naturals, for example, 16238496 + ... + 16238521.

It is an arithmetic number, because the mean of its divisors is an integer number (113669563).

Almost surely, 2^422201221 is an apocalyptic number.

It is an amenable number.

422201221 is a deficient number, since it is larger than the sum of its proper divisors (32477031).

422201221 is a wasteful number, since it uses less digits than its factorization.

422201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32477030.

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

The square root of 422201221 is about 20547.5356429914. The cubic root of 422201221 is about 750.1932663414.

Adding to 422201221 its reverse (122102224), we get a palindrome (544303445).

The spelling of 422201221 in words is "four hundred twenty-two million, two hundred one thousand, two hundred twenty-one".