422321200421 has 2 divisors, whose sum is σ = 422321200422. Its totient is φ = 422321200420.

The previous prime is 422321200417. The next prime is 422321200423. The reversal of 422321200421 is 124002123224.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 292155384196 + 130165816225 = 540514^2 + 360785^2 .

It is a cyclic number.

It is not a de Polignac number, because 422321200421 - 2² = 422321200417 is a prime.

It is a Sophie Germain prime.

Together with 422321200423, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (422321200423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211160600210 + 211160600211.

It is an arithmetic number, because the mean of its divisors is an integer number (211160600211).

Almost surely, 2^422321200421 is an apocalyptic number.

It is an amenable number.

422321200421 is a deficient number, since it is larger than the sum of its proper divisors (1).

422321200421 is an equidigital number, since it uses as much as digits as its factorization.

422321200421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 422321200421 its reverse (124002123224), we get a palindrome (546323323645).

The spelling of 422321200421 in words is "four hundred twenty-two billion, three hundred twenty-one million, two hundred thousand, four hundred twenty-one".