43221816 has 64 divisors (see below), whose sum is σ = 130982400. Its totient is φ = 13096800.

The previous prime is 43221797. The next prime is 43221821. The reversal of 43221816 is 61812234.

43221816 is a `hidden beast` number, since 432 + 218 + 16 = 666.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

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

It is a self number, because there is not a number n which added to its sum of digits gives 43221816.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 6720 + ... + 11471.

It is an arithmetic number, because the mean of its divisors is an integer number (2046600).

Almost surely, 2^43221816 is an apocalyptic number.

It is an amenable number.

43221816 is an abundant number, since it is smaller than the sum of its proper divisors (87760584).

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

43221816 is a wasteful number, since it uses less digits than its factorization.

43221816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18217 (or 18207 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 43221816 is about 6574.3300799397. The cubic root of 43221816 is about 350.9411838040.

It can be divided in two parts, 432218 and 16, that added together give a palindrome (432234).

The spelling of 43221816 in words is "forty-three million, two hundred twenty-one thousand, eight hundred sixteen".