43221220 has 24 divisors (see below), whose sum is σ = 103731264. Its totient is φ = 14818656.

The previous prime is 43221193. The next prime is 43221221. The reversal of 43221220 is 2212234.

It is a junction number, because it is equal to n+sod(n) for n = 43221194 and 43221203.

It is not an unprimeable number, because it can be changed into a prime (43221221) 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, 154222 + ... + 154501.

It is an arithmetic number, because the mean of its divisors is an integer number (4322136).

Almost surely, 2^43221220 is an apocalyptic number.

It is an amenable number.

43221220 is an abundant number, since it is smaller than the sum of its proper divisors (60510044).

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

43221220 is a wasteful number, since it uses less digits than its factorization.

43221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308739 (or 308737 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 43221220 is about 6574.2847519711. The cubic root of 43221220 is about 350.9395707150.

Adding to 43221220 its reverse (2212234), we get a palindrome (45433454).

The spelling of 43221220 in words is "forty-three million, two hundred twenty-one thousand, two hundred twenty".