diff --git a/javascript/PalindromeNumber.js b/javascript/PalindromeNumber.js
new file mode 100644
index 0000000..1670dd3
--- /dev/null
+++ b/javascript/PalindromeNumber.js
@@ -0,0 +1,20 @@
+// https://leetcode.com/problems/palindrome-number
+// T: O(log(n))
+// S: O(1)
+
+const isPalindrome = (x) => {
+  if (x < 0 || (x % 10 === 0 && x !== 0)) {
+    return false;
+  }
+  let result = x;
+  let sum = 0;
+  while (x !== 0) {
+    let remainder = x % 10;
+    sum = sum * 10 + remainder;
+    x = Math.floor(x / 10);
+  }
+  if (sum === result) {
+    return true;
+  }
+  return false;
+};