221204141 has 4 divisors (see below), whose sum is σ = 228831900. Its totient is φ = 213576384.

The previous prime is 221204129. The next prime is 221204161. The reversal of 221204141 is 141402122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 141402122 = 2 ⋅70701061.

It can be written as a sum of positive squares in 2 ways, for example, as 51423241 + 169780900 = 7171^2 + 13030^2 .

It is a cyclic number.

It is not a de Polignac number, because 221204141 - 2⁶ = 221204077 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221204161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3813836 + ... + 3813893.

It is an arithmetic number, because the mean of its divisors is an integer number (57207975).

Almost surely, 2^221204141 is an apocalyptic number.

It is an amenable number.

221204141 is a deficient number, since it is larger than the sum of its proper divisors (7627759).

221204141 is an equidigital number, since it uses as much as digits as its factorization.

221204141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7627758.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 221204141 is about 14872.9331673345. The cubic root of 221204141 is about 604.7804599244.

Adding to 221204141 its reverse (141402122), we get a palindrome (362606263).

The spelling of 221204141 in words is "two hundred twenty-one million, two hundred four thousand, one hundred forty-one".