43312321 has 8 divisors (see below), whose sum is σ = 46771200. Its totient is φ = 39871632.

The previous prime is 43312307. The next prime is 43312327. The reversal of 43312321 is 12321334.

43312321 is nontrivially palindromic in base 3.

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

It is a cyclic number.

It is not a de Polignac number, because 43312321 - 2¹⁹ = 42788033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43312327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 630 + ... + 9328.

It is an arithmetic number, because the mean of its divisors is an integer number (5846400).

Almost surely, 2^43312321 is an apocalyptic number.

It is an amenable number.

43312321 is a deficient number, since it is larger than the sum of its proper divisors (3458879).

43312321 is a wasteful number, since it uses less digits than its factorization.

43312321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9095.

The product of its digits is 432, while the sum is 19.

The square root of 43312321 is about 6581.2096912346. The cubic root of 43312321 is about 351.1859659616.

Adding to 43312321 its reverse (12321334), we get a palindrome (55633655).

The spelling of 43312321 in words is "forty-three million, three hundred twelve thousand, three hundred twenty-one".