221310241 has 4 divisors (see below), whose sum is σ = 221979184. Its totient is φ = 220641300.

The previous prime is 221310227. The next prime is 221310247. The reversal of 221310241 is 142013122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 142013122 = 2 ⋅71006561.

It is a cyclic number.

It is not a de Polignac number, because 221310241 - 2⁹ = 221309729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221310247) 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 in 3 ways as a sum of consecutive naturals, for example, 333975 + ... + 334636.

It is an arithmetic number, because the mean of its divisors is an integer number (55494796).

Almost surely, 2^221310241 is an apocalyptic number.

It is an amenable number.

221310241 is a deficient number, since it is larger than the sum of its proper divisors (668943).

221310241 is an equidigital number, since it uses as much as digits as its factorization.

221310241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 668942.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 221310241 is about 14876.4996218869. The cubic root of 221310241 is about 604.8771382687.

Adding to 221310241 its reverse (142013122), we get a palindrome (363323363).

The spelling of 221310241 in words is "two hundred twenty-one million, three hundred ten thousand, two hundred forty-one".