22128812 has 12 divisors (see below), whose sum is σ = 39772320. Its totient is φ = 10765296.

The previous prime is 22128811. The next prime is 22128839. The reversal of 22128812 is 21882122.

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 in 3 ways as a sum of consecutive naturals, for example, 74612 + ... + 74907.

It is an arithmetic number, because the mean of its divisors is an integer number (3314360).

Almost surely, 2^22128812 is an apocalyptic number.

It is an amenable number.

22128812 is a deficient number, since it is larger than the sum of its proper divisors (17643508).

22128812 is a wasteful number, since it uses less digits than its factorization.

22128812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149560 (or 149558 counting only the distinct ones).

The product of its digits is 1024, while the sum is 26.

The square root of 22128812 is about 4704.1271241326. The cubic root of 22128812 is about 280.7497423602.

The spelling of 22128812 in words is "twenty-two million, one hundred twenty-eight thousand, eight hundred twelve".