43243312221 has 12 divisors (see below), whose sum is σ = 63253228480. Its totient is φ = 28463951880.

The previous prime is 43243312169. The next prime is 43243312223. The reversal of 43243312221 is 12221334234.

43243312221 is a `hidden beast` number, since 4 + 3 + 2 + 433 + 1 + 2 + 221 = 666.

It is not a de Polignac number, because 43243312221 - 2³⁰ = 42169570397 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 (43243312223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30409495 + ... + 30410916.

Almost surely, 2^43243312221 is an apocalyptic number.

It is an amenable number.

43243312221 is a deficient number, since it is larger than the sum of its proper divisors (20009916259).

43243312221 is a wasteful number, since it uses less digits than its factorization.

43243312221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60820496 (or 60820493 counting only the distinct ones).

The product of its digits is 6912, while the sum is 27.

Adding to 43243312221 its reverse (12221334234), we get a palindrome (55464646455).

The spelling of 43243312221 in words is "forty-three billion, two hundred forty-three million, three hundred twelve thousand, two hundred twenty-one".