221403241 has 4 divisors (see below), whose sum is σ = 221458500. Its totient is φ = 221347984.

The previous prime is 221403199. The next prime is 221403263. The reversal of 221403241 is 142304122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26214400 + 195188841 = 5120^2 + 13971^2 .

It is a cyclic number.

It is not a de Polignac number, because 221403241 - 2⁷ = 221403113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221403641) 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, 21106 + ... + 29803.

It is an arithmetic number, because the mean of its divisors is an integer number (55364625).

Almost surely, 2^221403241 is an apocalyptic number.

It is an amenable number.

221403241 is a deficient number, since it is larger than the sum of its proper divisors (55259).

221403241 is an equidigital number, since it uses as much as digits as its factorization.

221403241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55258.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 221403241 is about 14879.6250288776. The cubic root of 221403241 is about 604.9618544809.

Adding to 221403241 its reverse (142304122), we get a palindrome (363707363).

The spelling of 221403241 in words is "two hundred twenty-one million, four hundred three thousand, two hundred forty-one".