22121443 has 4 divisors (see below), whose sum is σ = 22592160. Its totient is φ = 21650728.

The previous prime is 22121431. The next prime is 22121447. The reversal of 22121443 is 34412122.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22121443 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 22121443.

It is not an unprimeable number, because it can be changed into a prime (22121447) 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, 235288 + ... + 235381.

It is an arithmetic number, because the mean of its divisors is an integer number (5648040).

Almost surely, 2^22121443 is an apocalyptic number.

22121443 is a deficient number, since it is larger than the sum of its proper divisors (470717).

22121443 is an equidigital number, since it uses as much as digits as its factorization.

22121443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470716.

The product of its digits is 384, while the sum is 19.

The square root of 22121443 is about 4703.3438105246. The cubic root of 22121443 is about 280.7185752324.

Adding to 22121443 its reverse (34412122), we get a palindrome (56533565).

It can be divided in two parts, 2212 and 1443, that added together give a triangular number (3655 = T₈₅).

The spelling of 22121443 in words is "twenty-two million, one hundred twenty-one thousand, four hundred forty-three".