43222121 has 4 divisors (see below), whose sum is σ = 43338372. Its totient is φ = 43105872.

The previous prime is 43222111. The next prime is 43222139. The reversal of 43222121 is 12122234.

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 11806096 + 31416025 = 3436^2 + 5605^2 .

It is a cyclic number.

It is not a de Polignac number, because 43222121 - 2⁶ = 43222057 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 43222121.

It is not an unprimeable number, because it can be changed into a prime (43222111) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 57566 + ... + 58311.

It is an arithmetic number, because the mean of its divisors is an integer number (10834593).

Almost surely, 2^43222121 is an apocalyptic number.

It is an amenable number.

43222121 is a deficient number, since it is larger than the sum of its proper divisors (116251).

43222121 is a wasteful number, since it uses less digits than its factorization.

43222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116250.

The product of its digits is 192, while the sum is 17.

The square root of 43222121 is about 6574.3532761786. The cubic root of 43222121 is about 350.9420092884.

Adding to 43222121 its reverse (12122234), we get a palindrome (55344355).

The spelling of 43222121 in words is "forty-three million, two hundred twenty-two thousand, one hundred twenty-one".