Answer by haghighi (691) | Dec 03, 2016 at 11:28 AM
The admin account can NOT be deleted. You may create privileged admin accounts, which you can then use to manipulate access to the admin account, but deleting it is not possible.
The following links have more info:
http://www.ibm.com/support/knowledgecenter/SS9H2Y_7.5.0/com.ibm.dp.doc/user_accounts.html