144321043400221 has 4 divisors (see below), whose sum is σ = 144321068794492. Its totient is φ = 144321018005952.

The previous prime is 144321043400203. The next prime is 144321043400257. The reversal of 144321043400221 is 122004340123441.

It is a happy number.

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 41238873062500 + 103082170337721 = 6421750^2 + 10152939^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-144321043400221 is a prime.

It is a super-2 number, since 2×144321043400221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144321043400921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 182821 + ... + 16990453.

It is an arithmetic number, because the mean of its divisors is an integer number (36080267198623).

Almost surely, 2^{144321043400221} is an apocalyptic number.

It is an amenable number.

144321043400221 is a deficient number, since it is larger than the sum of its proper divisors (25394271).

144321043400221 is an equidigital number, since it uses as much as digits as its factorization.

144321043400221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25394270.

The product of its (nonzero) digits is 18432, while the sum is 31.

Adding to 144321043400221 its reverse (122004340123441), we get a palindrome (266325383523662).

The spelling of 144321043400221 in words is "one hundred forty-four trillion, three hundred twenty-one billion, forty-three million, four hundred thousand, two hundred twenty-one".