221444165 has 4 divisors (see below), whose sum is σ = 265733004. Its totient is φ = 177155328.

The previous prime is 221444143. The next prime is 221444173. The reversal of 221444165 is 561444122.

221444165 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 79691329 + 141752836 = 8927^2 + 11906^2 .

It is a cyclic number.

It is not a de Polignac number, because 221444165 - 2¹⁶ = 221378629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22144412 + ... + 22144421.

It is an arithmetic number, because the mean of its divisors is an integer number (66433251).

Almost surely, 2^221444165 is an apocalyptic number.

It is an amenable number.

221444165 is a deficient number, since it is larger than the sum of its proper divisors (44288839).

221444165 is an equidigital number, since it uses as much as digits as its factorization.

221444165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44288838.

The product of its digits is 7680, while the sum is 29.

The square root of 221444165 is about 14881.0001343996. Note that the first 3 decimals coincide. The cubic root of 221444165 is about 604.9991257415. Note that the first 3 decimals are identical.

Adding to 221444165 its reverse (561444122), we get a palindrome (782888287).

The spelling of 221444165 in words is "two hundred twenty-one million, four hundred forty-four thousand, one hundred sixty-five".