221584241 has 4 divisors (see below), whose sum is σ = 221771172. Its totient is φ = 221397312.

The previous prime is 221584229. The next prime is 221584301. The reversal of 221584241 is 142485122.

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 49056016 + 172528225 = 7004^2 + 13135^2 .

It is a cyclic number.

It is not a de Polignac number, because 221584241 - 2¹⁰ = 221583217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221584201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91676 + ... + 94061.

It is an arithmetic number, because the mean of its divisors is an integer number (55442793).

Almost surely, 2^221584241 is an apocalyptic number.

It is an amenable number.

221584241 is a deficient number, since it is larger than the sum of its proper divisors (186931).

221584241 is a wasteful number, since it uses less digits than its factorization.

221584241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186930.

The product of its digits is 5120, while the sum is 29.

The square root of 221584241 is about 14885.7059288433. The cubic root of 221584241 is about 605.1266642792.

The spelling of 221584241 in words is "two hundred twenty-one million, five hundred eighty-four thousand, two hundred forty-one".