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https://alexander.kirk.at/2007/08/24/what-does-size-in-intsize-of-mysql-mean/

mysql> alter table b change b b int(11);
Query OK, 1 row affected (0.00 sec)
Records: 1 Duplicates: 0 Warnings: 0
mysql> select * from b;
+-------+
| b |
+-------+
| 10000 |
+-------+
1 row in set (0.00 sec)

mysql> alter table b change b b int(11) zerofill;
Query OK, 1 row affected (0.00 sec)
Records: 1 Duplicates: 0 Warnings: 0

mysql> select * from b;
+-------------+
| b |
+-------------+
| 00000010000 |
+-------------+
1 row in set (0.00 sec)