221124241 has 4 divisors (see below), whose sum is σ = 238133812. Its totient is φ = 204114672.

The previous prime is 221124221. The next prime is 221124251. The reversal of 221124241 is 142421122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 142421122 = 2 ⋅71210561.

It can be written as a sum of positive squares in 2 ways, for example, as 86099841 + 135024400 = 9279^2 + 11620^2 .

It is a cyclic number.

It is not a de Polignac number, because 221124241 - 2¹¹ = 221122193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221124221) 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, 8504766 + ... + 8504791.

It is an arithmetic number, because the mean of its divisors is an integer number (59533453).

Almost surely, 2^221124241 is an apocalyptic number.

It is an amenable number.

221124241 is a deficient number, since it is larger than the sum of its proper divisors (17009571).

221124241 is a wasteful number, since it uses less digits than its factorization.

221124241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17009570.

The product of its digits is 256, while the sum is 19.

The square root of 221124241 is about 14870.2468372250. The cubic root of 221124241 is about 604.7076346181.

Adding to 221124241 its reverse (142421122), we get a palindrome (363545363).

The spelling of 221124241 in words is "two hundred twenty-one million, one hundred twenty-four thousand, two hundred forty-one".