How Many Zeros in a Decillion?
How many zeros in a decillion? A decillion has 33 zeros: 1,000,000,000,000,000,000,000,000,000,000,000, or 1033 in scientific notation. It follows nonillion (1030) and precedes undecillion (1036) in the short-scale sequence used in the United States and modern scientific contexts. Learn more about unvigintillion zeros.
A decillion has
33
zeros
- Written Form
- 1 followed by 33 zeros
- Scientific
- 10³³
Verifying the Zero Count in a Decillion
The direct answer: exactly 33 zeros. The number contains 11 groups of three zeros beyond the leading 1 — divide the written form into comma-separated groups and you'll count eleven of them. Learn more about how many zeros in a quattuordecillion.
What Number Is 1,000,000,000,000,000,000,000,000,000,000,000?
That number is a decillion. The deci- prefix means ten, referring to the tenth power of one thousand beyond the starting point: 1,00011 = 1033. This naming logic applies consistently across the short-scale sequence — each new "-illion" adds three zeros and increments the Latin prefix by one.
Some estimates of the total number of possible chemical reactions in the universe reach the decillion range — one of the few contexts where a number this large connects to physical science.
Decillion vs Its Neighbors
| Name | Zeros | Scientific notation |
|---|---|---|
| Nonillion | 30 | 1030 |
| Decillion | 33 | 1033 |
| Undecillion | 36 | 1036 |
Quick Zero-Counting Trick
1,000,000,000,000,000,000,000,000,000,000,000(one decillion) — 33 zeros10,000,000,000,000,000,000,000,000,000,000,000(ten decillion) — 34 zeros100,000,000,000,000,000,000,000,000,000,000,000(hundred decillion) — 35 zeros
How Many Zeros Does a Decillion Have in the Long Scale?
In the long-scale system used in parts of Europe, a decillion means something entirely different: 1060, or 60 zeros. The gap between the two conventions grows with every step up the naming ladder — by decillion, the long-scale value is 1027 times larger, a difference equal to one octillion. See also: Zeros in a quadrillion.
Zeros in a Decillion: FAQ
What comes before a decillion?
Quick answer
Hundred nonillion comes right before a decillion.
What comes after a decillion?
Quick answer
Ten decillion comes next, followed by hundred decillion and then undecillion.
How many digits does a decillion have?
A decillion has 34 digits in total — that's the digit 1 followed by 33 zeros.
How many zeros in 2 decillion? In half a decillion?
Two decillion keeps the same 33 zeros. Half a decillion has 32 trailing zeros after the 5.
Is a 33-digit number always a decillion?
No. A 33-digit number tops out at hundreds of nonillions before reaching a decillion — a decillion is the first 34-digit number.
How many zeros in a decillion in the British system?
Under the old long-scale system, a decillion meant 1060. In practice, any English-language source from the past 50 years — American or British — uses the short-scale definition: 33 zeros.