4443643321 has 4 divisors (see below), whose sum is σ = 4785462052. Its totient is φ = 4101824592.

The previous prime is 4443643319. The next prime is 4443643333. The reversal of 4443643321 is 1233463444.

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 2635692921 + 1807950400 = 51339^2 + 42520^2 .

It is a cyclic number.

It is not a de Polignac number, because 4443643321 - 2¹ = 4443643319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4443643921) 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, 170909346 + ... + 170909371.

It is an arithmetic number, because the mean of its divisors is an integer number (1196365513).

Almost surely, 2^4443643321 is an apocalyptic number.

It is an amenable number.

4443643321 is a deficient number, since it is larger than the sum of its proper divisors (341818731).

4443643321 is a wasteful number, since it uses less digits than its factorization.

4443643321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341818730.

The product of its digits is 82944, while the sum is 34.

The square root of 4443643321 is about 66660.6579700501. The cubic root of 4443643321 is about 1644.0425899353.

The spelling of 4443643321 in words is "four billion, four hundred forty-three million, six hundred forty-three thousand, three hundred twenty-one".