4243040221 has 4 divisors (see below), whose sum is σ = 4849188832. Its totient is φ = 3636891612.

The previous prime is 4243040213. The next prime is 4243040281. The reversal of 4243040221 is 1220403424.

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 4243040221 - 2³ = 4243040213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4243040192 and 4243040201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4243040281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 303074295 + ... + 303074308.

It is an arithmetic number, because the mean of its divisors is an integer number (1212297208).

Almost surely, 2^4243040221 is an apocalyptic number.

It is an amenable number.

4243040221 is a deficient number, since it is larger than the sum of its proper divisors (606148611).

4243040221 is an equidigital number, since it uses as much as digits as its factorization.

4243040221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606148610.

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 4243040221 is about 65138.6231125590. The cubic root of 4243040221 is about 1618.9212221681.

Adding to 4243040221 its reverse (1220403424), we get a palindrome (5463443645).

The spelling of 4243040221 in words is "four billion, two hundred forty-three million, forty thousand, two hundred twenty-one".