Get related product on with same category,brand,gender

include('app/Mage.php');
Mage::app();
$product = Mage::getModel('catalog/product')->load(2122);
$ids = $product->getCategoryIds();
//echo '<pre>';
//print_r($ids);
$latest_cat_id = $ids[count($ids)-1];
$_category = Mage::getModel('catalog/category')->load($latest_cat_id);
$_gender=Mage::getResourceModel('catalog/product')->getAttributeRawValue(2122, 'gender');
$_brand_name=Mage::getResourceModel('catalog/product')->getAttributeRawValue(2122, 'brand_name');
$catagory_model = Mage::getModel('catalog/category')->load($latest_cat_id); 
    $collection = Mage::getResourceModel('catalog/product_collection');
$collection->addCategoryFilter($catagory_model);
$collection->addFieldToFilter('brand_name',$_brand_name );
$collection->addFieldToFilter('gender',$_gender );
    $collection->addAttributeToFilter('status',1);
$collection->addAttributeToSelect('*');
//echo '<pre>';
$i=1;
foreach ($collection as $product)
{
echo $i." )- ".$product->getName();
echo '<br/>';
$i++;
}