144523021 has 4 divisors (see below), whose sum is σ = 145954044. Its totient is φ = 143092000.

The previous prime is 144523019. The next prime is 144523033. The reversal of 144523021 is 120325441.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120325441 = 101 ⋅1191341.

It can be written as a sum of positive squares in 2 ways, for example, as 86229796 + 58293225 = 9286^2 + 7635^2 .

It is a cyclic number.

It is not a de Polignac number, because 144523021 - 2¹ = 144523019 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 144522983 and 144523001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144523321) 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, 715360 + ... + 715561.

It is an arithmetic number, because the mean of its divisors is an integer number (36488511).

Almost surely, 2^144523021 is an apocalyptic number.

It is an amenable number.

144523021 is a deficient number, since it is larger than the sum of its proper divisors (1431023).

144523021 is a wasteful number, since it uses less digits than its factorization.

144523021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1431022.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 144523021 is about 12021.7727894017. The cubic root of 144523021 is about 524.7820967213.

Adding to 144523021 its reverse (120325441), we get a palindrome (264848462).

The spelling of 144523021 in words is "one hundred forty-four million, five hundred twenty-three thousand, twenty-one".