144521221 has 8 divisors (see below), whose sum is σ = 155877624. Its totient is φ = 133199040.

The previous prime is 144521207. The next prime is 144521227. The reversal of 144521221 is 122125441.

144521221 = T₂₈₅ + T₂₈₆ + ... + T₉₆₁.

It can be written as a sum of positive squares in 4 ways, for example, as 6200100 + 138321121 = 2490^2 + 11761^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 144521221 - 2⁵ = 144521189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 144521192 and 144521201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144521227) 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 7 ways as a sum of consecutive naturals, for example, 591 + ... + 17011.

It is an arithmetic number, because the mean of its divisors is an integer number (19484703).

Almost surely, 2^144521221 is an apocalyptic number.

It is an amenable number.

144521221 is a deficient number, since it is larger than the sum of its proper divisors (11356403).

144521221 is a wasteful number, since it uses less digits than its factorization.

144521221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17111.

The product of its digits is 640, while the sum is 22.

The square root of 144521221 is about 12021.6979250021. The cubic root of 144521221 is about 524.7799180334.

Adding to 144521221 its reverse (122125441), we get a palindrome (266646662).

The spelling of 144521221 in words is "one hundred forty-four million, five hundred twenty-one thousand, two hundred twenty-one".