4430221021 has 4 divisors (see below), whose sum is σ = 4430364700. Its totient is φ = 4430077344.

The previous prime is 4430220973. The next prime is 4430221039. The reversal of 4430221021 is 1201220344.

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 3811704121 + 618516900 = 61739^2 + 24870^2 .

It is a cyclic number.

It is not a de Polignac number, because 4430221021 - 2¹¹ = 4430218973 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4430221021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4430221091) 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, 4626 + ... + 94243.

It is an arithmetic number, because the mean of its divisors is an integer number (1107591175).

Almost surely, 2^4430221021 is an apocalyptic number.

It is an amenable number.

4430221021 is a deficient number, since it is larger than the sum of its proper divisors (143679).

4430221021 is an equidigital number, since it uses as much as digits as its factorization.

4430221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143678.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 4430221021 is about 66559.9055062430. The cubic root of 4430221021 is about 1642.3856096380.

Adding to 4430221021 its reverse (1201220344), we get a palindrome (5631441365).

The spelling of 4430221021 in words is "four billion, four hundred thirty million, two hundred twenty-one thousand, twenty-one".