22121828 has 24 divisors (see below), whose sum is σ = 41409144. Its totient is φ = 10304000.

The previous prime is 22121821. The next prime is 22121843. The reversal of 22121828 is 82812122.

It can be written as a sum of positive squares in 4 ways, for example, as 15194404 + 6927424 = 3898^2 + 2632^2 .

It is a junction number, because it is equal to n+sod(n) for n = 22121797 and 22121806.

It is not an unprimeable number, because it can be changed into a prime (22121821) 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 7 ways as a sum of consecutive naturals, for example, 5258 + ... + 8478.

It is an arithmetic number, because the mean of its divisors is an integer number (1725381).

Almost surely, 2^22121828 is an apocalyptic number.

It is an amenable number.

22121828 is a deficient number, since it is larger than the sum of its proper divisors (19287316).

22121828 is a wasteful number, since it uses less digits than its factorization.

22121828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3343 (or 3341 counting only the distinct ones).

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

The square root of 22121828 is about 4703.3847386749. The cubic root of 22121828 is about 280.7202037582.

The spelling of 22121828 in words is "twenty-two million, one hundred twenty-one thousand, eight hundred twenty-eight".