4444163021 has 4 divisors (see below), whose sum is σ = 4444718652. Its totient is φ = 4443607392.

The previous prime is 4444163011. The next prime is 4444163033. The reversal of 4444163021 is 1203614444.

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 2835030025 + 1609132996 = 53245^2 + 40114^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4444163021 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 (4444163011) 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, 265640 + ... + 281873.

It is an arithmetic number, because the mean of its divisors is an integer number (1111179663).

Almost surely, 2^4444163021 is an apocalyptic number.

It is an amenable number.

4444163021 is a deficient number, since it is larger than the sum of its proper divisors (555631).

4444163021 is an equidigital number, since it uses as much as digits as its factorization.

4444163021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555630.

The product of its (nonzero) digits is 9216, while the sum is 29.

The square root of 4444163021 is about 66664.5559574201. Note that the first 3 decimals coincide. The cubic root of 4444163021 is about 1644.1066796597.

Adding to 4444163021 its reverse (1203614444), we get a palindrome (5647777465).

The spelling of 4444163021 in words is "four billion, four hundred forty-four million, one hundred sixty-three thousand, twenty-one".