221320241 has 8 divisors (see below), whose sum is σ = 223634664. Its totient is φ = 219018240.

The previous prime is 221320223. The next prime is 221320243. The reversal of 221320241 is 142023122.

It can be written as a sum of positive squares in 4 ways, for example, as 110986225 + 110334016 = 10535^2 + 10504^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221320241 - 2¹⁴ = 221303857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221320243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35111 + ... + 40931.

It is an arithmetic number, because the mean of its divisors is an integer number (27954333).

Almost surely, 2^221320241 is an apocalyptic number.

It is an amenable number.

221320241 is a deficient number, since it is larger than the sum of its proper divisors (2314423).

221320241 is a wasteful number, since it uses less digits than its factorization.

221320241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6211.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 221320241 is about 14876.8357186601. The cubic root of 221320241 is about 604.8862486775.

Adding to 221320241 its reverse (142023122), we get a palindrome (363343363).

The spelling of 221320241 in words is "two hundred twenty-one million, three hundred twenty thousand, two hundred forty-one".