144221221 has 4 divisors (see below), whose sum is σ = 144367744. Its totient is φ = 144074700.

The previous prime is 144221213. The next prime is 144221237. The reversal of 144221221 is 122122441.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 144221221 - 2³ = 144221213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144221291) 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, 71775 + ... + 73756.

It is an arithmetic number, because the mean of its divisors is an integer number (36091936).

Almost surely, 2^144221221 is an apocalyptic number.

It is an amenable number.

144221221 is a deficient number, since it is larger than the sum of its proper divisors (146523).

144221221 is an equidigital number, since it uses as much as digits as its factorization.

144221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146522.

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

The square root of 144221221 is about 12009.2140042552. The cubic root of 144221221 is about 524.4165503218.

Adding to 144221221 its reverse (122122441), we get a palindrome (266343662).

The spelling of 144221221 in words is "one hundred forty-four million, two hundred twenty-one thousand, two hundred twenty-one".