144442021 has 4 divisors (see below), whose sum is σ = 145931212. Its totient is φ = 142952832.

The previous prime is 144442003. The next prime is 144442049. The reversal of 144442021 is 120244441.

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 61449921 + 82992100 = 7839^2 + 9110^2 .

It is a cyclic number.

It is not a de Polignac number, because 144442021 - 2⁹ = 144441509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 144441983 and 144442001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144442061) 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, 744450 + ... + 744643.

It is an arithmetic number, because the mean of its divisors is an integer number (36482803).

Almost surely, 2^144442021 is an apocalyptic number.

It is an amenable number.

144442021 is a deficient number, since it is larger than the sum of its proper divisors (1489191).

144442021 is an equidigital number, since it uses as much as digits as its factorization.

144442021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1489190.

The product of its (nonzero) digits is 1024, while the sum is 22.

The square root of 144442021 is about 12018.4034297406. The cubic root of 144442021 is about 524.6840378485.

Adding to 144442021 its reverse (120244441), we get a palindrome (264686462).

It can be divided in two parts, 1444420 and 21, that added together give a palindrome (1444441).

The spelling of 144442021 in words is "one hundred forty-four million, four hundred forty-two thousand, twenty-one".