Calculate the number 2421

A Sunday school teacher asked her students to draw a picture of their favorite Old Testament story. As she moved around the class, she saw there were many wonderful drawings being done. Then she came across the drawing of one little boy. He was busy drawing a man driving an old car. In the backseat were two passengers—both scantily dressed.”"It's a lovely picture,” prompted the teacher, “but which story does it tell?”The little boy seemed surprised at the question. “Well,” he exclaimed, “doesn't it say in the Bible that God drove Adam and Eve out of the Garden of Eden?”