4243042321 has 4 divisors (see below), whose sum is σ = 4849191232. Its totient is φ = 3636893412.

The previous prime is 4243042319. The next prime is 4243042327. The reversal of 4243042321 is 1232403424.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 4243042321 - 2¹ = 4243042319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4243042327) 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, 303074445 + ... + 303074458.

It is an arithmetic number, because the mean of its divisors is an integer number (1212297808).

Almost surely, 2^4243042321 is an apocalyptic number.

It is an amenable number.

4243042321 is a deficient number, since it is larger than the sum of its proper divisors (606148911).

4243042321 is an equidigital number, since it uses as much as digits as its factorization.

4243042321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606148910.

The product of its (nonzero) digits is 4608, while the sum is 25.

The square root of 4243042321 is about 65138.6392320257. The cubic root of 4243042321 is about 1618.9214892513.

Adding to 4243042321 its reverse (1232403424), we get a palindrome (5475445745).

The spelling of 4243042321 in words is "four billion, two hundred forty-three million, forty-two thousand, three hundred twenty-one".