144021221 has 8 divisors (see below), whose sum is σ = 149125080. Its totient is φ = 138926592.

The previous prime is 144021209. The next prime is 144021277. The reversal of 144021221 is 122120441.

144021221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 261121 + 143760100 = 511^2 + 11990^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 144021221 - 2¹⁰ = 144020197 is a prime.

It is a super-2 number, since 2×144021221² = 41484224196661682, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 144021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144021721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49421 + ... + 52253.

It is an arithmetic number, because the mean of its divisors is an integer number (18640635).

Almost surely, 2^144021221 is an apocalyptic number.

It is an amenable number.

144021221 is a deficient number, since it is larger than the sum of its proper divisors (5103859).

144021221 is a wasteful number, since it uses less digits than its factorization.

144021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4615.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 144021221 is about 12000.8841757597. The cubic root of 144021221 is about 524.1740251480.

Adding to 144021221 its reverse (122120441), we get a palindrome (266141662).

The spelling of 144021221 in words is "one hundred forty-four million, twenty-one thousand, two hundred twenty-one".