43022221 has 4 divisors (see below), whose sum is σ = 46933344. Its totient is φ = 39111100.

The previous prime is 43022197. The next prime is 43022227. The reversal of 43022221 is 12222034.

43022221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43022221 is a prime.

It is a super-2 number, since 2×43022221² = 3701822999545682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 43022195 and 43022204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43022227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1955545 + ... + 1955566.

It is an arithmetic number, because the mean of its divisors is an integer number (11733336).

Almost surely, 2^43022221 is an apocalyptic number.

It is an amenable number.

43022221 is a deficient number, since it is larger than the sum of its proper divisors (3911123).

43022221 is a wasteful number, since it uses less digits than its factorization.

43022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3911122.

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

The square root of 43022221 is about 6559.1326408299. The cubic root of 43022221 is about 350.4001437148.

Adding to 43022221 its reverse (12222034), we get a palindrome (55244255).

The spelling of 43022221 in words is "forty-three million, twenty-two thousand, two hundred twenty-one".