Error creating table: "An identifier with more than 30 characters was specified"

I have problems when trying to execute the script to create the client table, I leave the code and the tables with which it interacts with its respective problem.

CLIENT TABLE

CREATE TABLE CLIENTE(
RUT VARCHAR2(10) CONSTRAINT PK_CLIENTE PRIMARY KEY,
NOMBRE VARCHAR2(20) CONSTRAINT NOTNULL_NOMBRE_CLIENTE NOT NULL,
APELLIDOP VARCHAR2(30) CONSTRAINT NOTNULL_APELLIDOP_CLIENTE NOT NULL,
APELLIDOM VARCHAR2(30) CONSTRAINT NOTNNULL_APELLIDOM_CLIENTE NOT NULL,
DIRECCION VARCHAR2(100) CONSTRAINT NOTNULL_DIRECCION_CLIENTE NOT NULL,
TELEFONO NUMBER(8) CONSTRAINT NOTNULL_TELEFONO_CLIENTE NOT NULL,
EMAIL VARCHAR2(255) CONSTRAINT NOTNULL_EMAIL_CLIENTE NOT NULL,
FECHA_NACIMIENTO DATE CONSTRAINT NOTNULL_FECHA_NACIMIENTO_CLIENTE NOT NULL,
SEXO CHAR(1) CONSTRAINT NOTNULL_SEXO_CLIENTE NOT NULL,
CIUDAD_COD_CIUDAD NUMBER CONSTRAINT NOTNULL_CIUDAD_COD_CIUAD NOT NULL,
CONSTRAINT FK_CLIENTE_CIUDAD FOREIGN KEY(CIUDAD_COD_CIUDAD) REFERENCES CIUDAD(COD_CIUDAD)
);

CITY TABLE

CREATE TABLE CIUDAD(
COD_CIUDAD NUMBER CONSTRAINT PK_CIUDAD PRIMARY KEY,
NOMBRE_CIUDAD VARCHAR2(20) CONSTRAINT NOTNULL_NOMBRE_CIUDAD NOT NULL,
NOMBRE_REGION VARCHAR2(20) CONSTRAINT NOTNULL_NOMBRE_REGION NOT NULL
);

ERROR CASTED BY SQL DEVELOPER (version 17xxx).

Informe de error 
ORA-00972: identifier is too long
00972. 00000 -  "identifier is too long"
*Cause:    An identifier with more than 30 characters was specified.
*Action:   Specify at most 30 characters.

I hope you can help me.