22128818 has 4 divisors (see below), whose sum is σ = 33193230. Its totient is φ = 11064408.

The previous prime is 22128811. The next prime is 22128839. The reversal of 22128818 is 81882122.

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

It can be written as a sum of positive squares in only one way, i.e., 22118209 + 10609 = 4703^2 + 103^2 .

It is not an unprimeable number, because it can be changed into a prime (22128811) 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 as a sum of consecutive naturals, namely, 5532203 + ... + 5532206.

Almost surely, 2^22128818 is an apocalyptic number.

22128818 is a deficient number, since it is larger than the sum of its proper divisors (11064412).

22128818 is a wasteful number, since it uses less digits than its factorization.

22128818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11064411.

The product of its digits is 4096, while the sum is 32.

The square root of 22128818 is about 4704.1277618704. The cubic root of 22128818 is about 280.7497677344.

The spelling of 22128818 in words is "twenty-two million, one hundred twenty-eight thousand, eight hundred eighteen".