How many zeros in a septillion?

Answer 1

24

In countries that use the long scale (eg Europe) there are 42 zeros:

1 billion = 1 bi-million = 1million2 = 1012

1 trillion = 1 tri-million = 1million3 = 1018

⇒ 1 septillion = 1sept-million = 1million7 = 1042

In countries that use the short scale (eg USA) there are 24 zeros:

1 billion = a thousand million = 109

1 trillion = a thousand2 million = 1012

⇒ 1 septillion = a thousand6 million = 1024