422130221 has 4 divisors (see below), whose sum is σ = 424273212. Its totient is φ = 419987232.

The previous prime is 422130209. The next prime is 422130229. The reversal of 422130221 is 122031224.

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 359102500 + 63027721 = 18950^2 + 7939^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-422130221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 422130221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (422130229) 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, 1071200 + ... + 1071593.

It is an arithmetic number, because the mean of its divisors is an integer number (106068303).

Almost surely, 2^422130221 is an apocalyptic number.

It is an amenable number.

422130221 is a deficient number, since it is larger than the sum of its proper divisors (2142991).

422130221 is a wasteful number, since it uses less digits than its factorization.

422130221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2142990.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 422130221 is about 20545.8078692467. The cubic root of 422130221 is about 750.1512115854.

Adding to 422130221 its reverse (122031224), we get a palindrome (544161445).

The spelling of 422130221 in words is "four hundred twenty-two million, one hundred thirty thousand, two hundred twenty-one".