4043043221 has 4 divisors (see below), whose sum is σ = 4620620832. Its totient is φ = 3465465612.

The previous prime is 4043043203. The next prime is 4043043227. The reversal of 4043043221 is 1223403404.

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 4043043221 - 2¹⁰ = 4043042197 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 (4043043227) 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, 288788795 + ... + 288788808.

It is an arithmetic number, because the mean of its divisors is an integer number (1155155208).

Almost surely, 2^4043043221 is an apocalyptic number.

It is an amenable number.

4043043221 is a deficient number, since it is larger than the sum of its proper divisors (577577611).

4043043221 is an equidigital number, since it uses as much as digits as its factorization.

4043043221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577577610.

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 4043043221 is about 63584.9291970983. The cubic root of 4043043221 is about 1593.0746540551.

Adding to 4043043221 its reverse (1223403404), we get a palindrome (5266446625).

The spelling of 4043043221 in words is "four billion, forty-three million, forty-three thousand, two hundred twenty-one".