422200421 has 2 divisors, whose sum is σ = 422200422. Its totient is φ = 422200420.

The previous prime is 422200381. The next prime is 422200477. The reversal of 422200421 is 124002224.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 323496196 + 98704225 = 17986^2 + 9935^2 .

It is a cyclic number.

It is not a de Polignac number, because 422200421 - 2¹⁸ = 421938277 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 422200421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (422200021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211100210 + 211100211.

It is an arithmetic number, because the mean of its divisors is an integer number (211100211).

Almost surely, 2^422200421 is an apocalyptic number.

It is an amenable number.

422200421 is a deficient number, since it is larger than the sum of its proper divisors (1).

422200421 is an equidigital number, since it uses as much as digits as its factorization.

422200421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 422200421 is about 20547.5161759274. The cubic root of 422200421 is about 750.1927925112.

Adding to 422200421 its reverse (124002224), we get a palindrome (546202645).

The spelling of 422200421 in words is "four hundred twenty-two million, two hundred thousand, four hundred twenty-one".