1440144021 has 4 divisors (see below), whose sum is σ = 1920192032. Its totient is φ = 960096012.

The previous prime is 1440143989. The next prime is 1440144023. The reversal of 1440144021 is 1204410441.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1440144021 - 2⁵ = 1440143989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1440144023) 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, 240024001 + ... + 240024006.

It is an arithmetic number, because the mean of its divisors is an integer number (480048008).

Almost surely, 2^1440144021 is an apocalyptic number.

It is an amenable number.

1440144021 is a deficient number, since it is larger than the sum of its proper divisors (480048011).

1440144021 is an equidigital number, since it uses as much as digits as its factorization.

1440144021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480048010.

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 1440144021 is about 37949.2295178703. The cubic root of 1440144021 is about 1129.2808803328.

Adding to 1440144021 its reverse (1204410441), we get a palindrome (2644554462).

The spelling of 1440144021 in words is "one billion, four hundred forty million, one hundred forty-four thousand, twenty-one".