43222021 has 4 divisors (see below), whose sum is σ = 43238700. Its totient is φ = 43205344.

The previous prime is 43221961. The next prime is 43222033. The reversal of 43222021 is 12022234.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25908100 + 17313921 = 5090^2 + 4161^2 .

It is a cyclic number.

It is not a de Polignac number, because 43222021 - 2⁹ = 43221509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 43221986 and 43222004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43222051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3526 + ... + 9943.

It is an arithmetic number, because the mean of its divisors is an integer number (10809675).

Almost surely, 2^43222021 is an apocalyptic number.

It is an amenable number.

43222021 is a deficient number, since it is larger than the sum of its proper divisors (16679).

43222021 is a wasteful number, since it uses less digits than its factorization.

43222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16678.

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

The square root of 43222021 is about 6574.3456708634. The cubic root of 43222021 is about 350.9417386382.

Adding to 43222021 its reverse (12022234), we get a palindrome (55244255).

It can be divided in two parts, 4 and 3222021, that added together give a square (3222025 = 1795²).

The spelling of 43222021 in words is "forty-three million, two hundred twenty-two thousand, twenty-one".