43221216 has 96 divisors (see below), whose sum is σ = 118540800. Its totient is φ = 13777920.

The previous prime is 43221193. The next prime is 43221221. The reversal of 43221216 is 61212234.

It is a tau number, because it is divible by the number of its divisors (96).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 43221192 and 43221201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 310875 + ... + 311013.

It is an arithmetic number, because the mean of its divisors is an integer number (1234800).

Almost surely, 2^43221216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 43221216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59270400).

43221216 is an abundant number, since it is smaller than the sum of its proper divisors (75319584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

43221216 is a wasteful number, since it uses less digits than its factorization.

43221216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272 (or 264 counting only the distinct ones).

The product of its digits is 576, while the sum is 21.

The square root of 43221216 is about 6574.2844477555. The cubic root of 43221216 is about 350.9395598889.

The spelling of 43221216 in words is "forty-three million, two hundred twenty-one thousand, two hundred sixteen".