How Many Zeros in a Nonillion?
By Vinitha Published Updated
How many zeros in a nonillion? A nonillion has 30 zeros, written as 1,000,000,000,000,000,000,000,000,000,000 or 1030 in scientific notation. The prefix noni- means nine, reflecting the ninth group of three zeros in the short-scale system used in the United States and modern British English. Questions about the $1M shorthand are answered in how many zeros in a million.
A nonillion has
30
zeros
- Written Form
- 1 followed by 30 zeros
- Scientific
- 10³⁰
Nonillion's Position in the Short-Scale Sequence
The direct answer: exactly 30 zeros. One nonillion equals one thousand octillion, and comes directly before decillion in the number sequence.
How Many Zeros Are in Nonillion Compared to Octillion and Decillion?
Nonillion sits between octillion and decillion in the short-scale sequence, each step adding three more zeros. Zeros in a duodecillion covers Latin prefixes in -illion names alongside how to pronounce duodecillion.
| Name | Zeros | Scientific notation |
|---|---|---|
| Octillion | 27 | 1027 |
| Nonillion | 30 | 1030 |
| Decillion | 33 | 1033 |
Quick Zero-Counting Trick
Write the digit 1 and count out ten groups of three zeros — you'll reach 30 zeros and 1,000,000,000,000,000,000,000,000,000,000. In scientific notation, the exponent gives you the same count directly.
Nonillion in Cosmology and Physics
At this scale, quantities appear in cosmology and quantum physics. Questions about comma grouping in 1,000 are answered in zeros in a thousand.
The estimated number of atoms in the observable universe is roughly 1080 — a nonillion (1030) is a relatively small slice of that figure, yet still vastly larger than anything countable in everyday life.
The total number of grains of sand on Earth (~7 × 1018) falls twelve orders of magnitude short of one nonillion.
- 1 nonillion = 1,000 octillion
- 1 nonillion = 1 trillion trillion million (1012 × 1012 × 106)
- 1 nonillion = 1,000,000,000,000 quintillion
How Many Zeros Does the Long-Scale Nonillion Have?
In the long-scale numbering system, a nonillion has 54 zeros (1054), not 30. The long scale defines each "-illion" as one million times the previous, so long-scale nonillion = (106)9 = 1054 — a difference of one full septillion (1024) from the short-scale value.
Watch: How Many Zeros in a Nonillion?
How many zeros in a nonillion? A nonillion has 30 zeros — 1 followed by 30 zeros. Watch this short video for the zero count, the written form and the notation at a glance.
Zeros in a Nonillion: FAQ
What comes before a nonillion?
Quick answer
Hundred octillion comes right before a nonillion.
What comes after a nonillion?
Quick answer
Ten nonillion comes next, followed by hundred nonillion and then decillion.
How many digits does a nonillion have?
A nonillion has 31 digits in total — that's the digit 1 followed by 30 zeros.
How many zeros in 2 nonillion? In half a nonillion?
Two nonillion keeps the same 30 zeros. Half a nonillion has 29 trailing zeros after the 5.
Is a 30-digit number always a nonillion?
No. A 30-digit number tops out at hundreds of octillions before reaching a nonillion — a nonillion is the first 31-digit number.
How many zeros in a nonillion in the British system?
Under the old long-scale system, "nonillion" refers to 1054. Modern scientific papers and financial documents use scientific notation exclusively at these scales precisely to avoid this ambiguity — 1030 means the same thing everywhere, regardless of naming convention.
About the Author
Designer and Developer · Palakkad, Kerala, India
Vinitha holds a bachelor's degree in Textile and Apparel Design from Avinashilingam University, plus a C-Tech certificate in Graphic Design from Image Creative Education. She builds free, no-clutter reference tools like How Many Zeros. Read her full bio.