221422361 has 2 divisors, whose sum is σ = 221422362. Its totient is φ = 221422360.

The previous prime is 221422349. The next prime is 221422363. The reversal of 221422361 is 163224122.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 216825625 + 4596736 = 14725^2 + 2144^2 .

It is a cyclic number.

It is not a de Polignac number, because 221422361 - 2¹⁸ = 221160217 is a prime.

Together with 221422363, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (221422363) 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, 110711180 + 110711181.

It is an arithmetic number, because the mean of its divisors is an integer number (110711181).

Almost surely, 2^221422361 is an apocalyptic number.

It is an amenable number.

221422361 is a deficient number, since it is larger than the sum of its proper divisors (1).

221422361 is an equidigital number, since it uses as much as digits as its factorization.

221422361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 23.

The square root of 221422361 is about 14880.2675043159. The cubic root of 221422361 is about 604.9792684652.

Adding to 221422361 its reverse (163224122), we get a palindrome (384646483).

The spelling of 221422361 in words is "two hundred twenty-one million, four hundred twenty-two thousand, three hundred sixty-one".