1444444021 has 4 divisors (see below), whose sum is σ = 1444551372. Its totient is φ = 1444336672.

The previous prime is 1444444009. The next prime is 1444444031. The reversal of 1444444021 is 1204444441.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 444999025 + 999444996 = 21095^2 + 31614^2 .

It is a cyclic number.

It is not a de Polignac number, because 1444444021 - 2¹³ = 1444435829 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 (1444444031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30016 + ... + 61561.

It is an arithmetic number, because the mean of its divisors is an integer number (361137843).

Almost surely, 2^1444444021 is an apocalyptic number.

It is an amenable number.

1444444021 is a deficient number, since it is larger than the sum of its proper divisors (107351).

1444444021 is an equidigital number, since it uses as much as digits as its factorization.

1444444021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107350.

The product of its (nonzero) digits is 8192, while the sum is 28.

The square root of 1444444021 is about 38005.8419325240. The cubic root of 1444444021 is about 1130.4037038773.

Adding to 1444444021 its reverse (1204444441), we get a palindrome (2648888462).

The spelling of 1444444021 in words is "one billion, four hundred forty-four million, four hundred forty-four thousand, twenty-one".