221422249 has 2 divisors, whose sum is σ = 221422250. Its totient is φ = 221422248.

The previous prime is 221422247. The next prime is 221422259. The reversal of 221422249 is 942224122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120560400 + 100861849 = 10980^2 + 10043^2 .

It is a cyclic number.

It is not a de Polignac number, because 221422249 - 2¹ = 221422247 is a prime.

Together with 221422247, 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 (221422241) 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, 110711124 + 110711125.

It is an arithmetic number, because the mean of its divisors is an integer number (110711125).

Almost surely, 2^221422249 is an apocalyptic number.

It is an amenable number.

221422249 is a deficient number, since it is larger than the sum of its proper divisors (1).

221422249 is an equidigital number, since it uses as much as digits as its factorization.

221422249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 28.

The square root of 221422249 is about 14880.2637409422. The cubic root of 221422249 is about 604.9791664615.

The spelling of 221422249 in words is "two hundred twenty-one million, four hundred twenty-two thousand, two hundred forty-nine".