22138 has 4 divisors (see below), whose sum is σ = 33210. Its totient is φ = 11068.

The previous prime is 22133. The next prime is 22147. The reversal of 22138 is 83122.

It is a happy number.

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., 21609 + 529 = 147^2 + 23^2 .

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (22133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5533 + ... + 5536.

2²²¹³⁸ is an apocalyptic number.

22138 is a deficient number, since it is larger than the sum of its proper divisors (11072).

22138 is a wasteful number, since it uses less digits than its factorization.

22138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11071.

The product of its digits is 96, while the sum is 16.

The square root of 22138 is about 148.7884404112. The cubic root of 22138 is about 28.0788593244.

Subtracting from 22138 its sum of digits (16), we obtain a palindrome (22122).

The spelling of 22138 in words is "twenty-two thousand, one hundred thirty-eight".