22121843 has 2 divisors, whose sum is σ = 22121844. Its totient is φ = 22121842.

The previous prime is 22121821. The next prime is 22121849. The reversal of 22121843 is 34812122.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22121843 - 2⁶ = 22121779 is a prime.

It is not a weakly prime, because it can be changed into another prime (22121849) 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 as a sum of consecutive naturals, namely, 11060921 + 11060922.

It is an arithmetic number, because the mean of its divisors is an integer number (11060922).

Almost surely, 2^22121843 is an apocalyptic number.

22121843 is a deficient number, since it is larger than the sum of its proper divisors (1).

22121843 is an equidigital number, since it uses as much as digits as its factorization.

22121843 is an odious number, because the sum of its binary digits is odd.

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

The square root of 22121843 is about 4703.3863332710. The cubic root of 22121843 is about 280.7202672069.

Adding to 22121843 its reverse (34812122), we get a palindrome (56933965).

The spelling of 22121843 in words is "twenty-two million, one hundred twenty-one thousand, eight hundred forty-three".