22121138 has 16 divisors (see below), whose sum is σ = 35845656. Its totient is φ = 10177920.

The previous prime is 22121137. The next prime is 22121159. The reversal of 22121138 is 83112122.

It can be written as a sum of positive squares in 4 ways, for example, as 16752649 + 5368489 = 4093^2 + 2317^2 .

It is not an unprimeable number, because it can be changed into a prime (22121137) 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, 8558 + ... + 10838.

Almost surely, 2^22121138 is an apocalyptic number.

22121138 is a deficient number, since it is larger than the sum of its proper divisors (13724518).

22121138 is a wasteful number, since it uses less digits than its factorization.

22121138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2669.

The product of its digits is 192, while the sum is 20.

The square root of 22121138 is about 4703.3113866722. The cubic root of 22121138 is about 280.7172850881.

The spelling of 22121138 in words is "twenty-two million, one hundred twenty-one thousand, one hundred thirty-eight".