43822121 has 6 divisors (see below), whose sum is σ = 50976810. Its totient is φ = 37561776.

The previous prime is 43822109. The next prime is 43822139. The reversal of 43822121 is 12122834.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 22992025 + 20830096 = 4795^2 + 4564^2 .

It is not a de Polignac number, because 43822121 - 2⁶ = 43822057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43822021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 447116 + ... + 447213.

It is an arithmetic number, because the mean of its divisors is an integer number (8496135).

Almost surely, 2^43822121 is an apocalyptic number.

It is an amenable number.

43822121 is a deficient number, since it is larger than the sum of its proper divisors (7154689).

43822121 is an equidigital number, since it uses as much as digits as its factorization.

43822121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 894343 (or 894336 counting only the distinct ones).

The product of its digits is 768, while the sum is 23.

The square root of 43822121 is about 6619.8278678528. The cubic root of 43822121 is about 352.5584524900.

Adding to 43822121 its reverse (12122834), we get a palindrome (55944955).

The spelling of 43822121 in words is "forty-three million, eight hundred twenty-two thousand, one hundred twenty-one".