221422241 has 2 divisors, whose sum is σ = 221422242. Its totient is φ = 221422240.

The previous prime is 221422237. The next prime is 221422247. The reversal of 221422241 is 142224122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 161823841 + 59598400 = 12721^2 + 7720^2 .

It is a cyclic number.

It is not a de Polignac number, because 221422241 - 2² = 221422237 is a prime.

It is not a weakly prime, because it can be changed into another prime (221422247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110711120 + 110711121.

It is an arithmetic number, because the mean of its divisors is an integer number (110711121).

Almost surely, 2^221422241 is an apocalyptic number.

It is an amenable number.

221422241 is a deficient number, since it is larger than the sum of its proper divisors (1).

221422241 is an equidigital number, since it uses as much as digits as its factorization.

221422241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 512, while the sum is 20.

The square root of 221422241 is about 14880.2634721298. The cubic root of 221422241 is about 604.9791591755.

Adding to 221422241 its reverse (142224122), we get a palindrome (363646363).

The spelling of 221422241 in words is "two hundred twenty-one million, four hundred twenty-two thousand, two hundred forty-one".