4243312221 has 8 divisors (see below), whose sum is σ = 5679263040. Its totient is φ = 2818118112.

The previous prime is 4243312211. The next prime is 4243312243. The reversal of 4243312221 is 1222133424.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 4243312221 - 2¹⁷ = 4243181149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4243312191 and 4243312200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4243312201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2688256 + ... + 2689833.

It is an arithmetic number, because the mean of its divisors is an integer number (709907880).

Almost surely, 2^4243312221 is an apocalyptic number.

It is an amenable number.

4243312221 is a deficient number, since it is larger than the sum of its proper divisors (1435950819).

4243312221 is a wasteful number, since it uses less digits than its factorization.

4243312221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5378355.

The product of its digits is 2304, while the sum is 24.

The square root of 4243312221 is about 65140.7109341002. The cubic root of 4243312221 is about 1618.9558150654.

Adding to 4243312221 its reverse (1222133424), we get a palindrome (5465445645).

The spelling of 4243312221 in words is "four billion, two hundred forty-three million, three hundred twelve thousand, two hundred twenty-one".