144220221 has 6 divisors (see below), whose sum is σ = 208318110. Its totient is φ = 96146808.

The previous prime is 144220207. The next prime is 144220273. The reversal of 144220221 is 122022441.

144220221 is a `hidden beast` number, since 1 + 442 + 2 + 0 + 221 = 666.

It can be written as a sum of positive squares in only one way, i.e., 90725625 + 53494596 = 9525^2 + 7314^2 .

It is not a de Polignac number, because 144220221 - 2⁶ = 144220157 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 144220194 and 144220203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144220201) 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 5 ways as a sum of consecutive naturals, for example, 8012226 + ... + 8012243.

It is an arithmetic number, because the mean of its divisors is an integer number (34719685).

Almost surely, 2^144220221 is an apocalyptic number.

It is an amenable number.

144220221 is a deficient number, since it is larger than the sum of its proper divisors (64097889).

144220221 is a wasteful number, since it uses less digits than its factorization.

144220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16024475 (or 16024472 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 144220221 is about 12009.1723694849. The cubic root of 144220221 is about 524.4153382538.

Adding to 144220221 its reverse (122022441), we get a palindrome (266242662).

It can be divided in two parts, 144220 and 221, that added together give a palindrome (144441).

The spelling of 144220221 in words is "one hundred forty-four million, two hundred twenty thousand, two hundred twenty-one".