Scientific Notation Calculator › 21 in scientific notation
21 in Scientific Notation
21 = 2.1 × 10¹
| Standard form | 2.1 × 10¹ |
| Coefficient | 2.1 |
| Exponent | 1 |
How 21 breaks down
21 has 2 digits, so it lands in the tens — the order of magnitude 10¹. That is why the exponent is 1.
| Expanded form | 2.1 × 10 |
| E-notation (calculators) | 2.1E1 |
| Significant figures | 2 |
| Order of magnitude | 10¹ (tens) |
Reading it back: 2.1 × 10 = 21.
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Frequently asked questions
What is 21 in scientific notation?
21 in scientific notation is 2.1 × 10¹. The coefficient is 2.1 and the exponent is 1.
How do you convert 21 to scientific notation?
Move the decimal point so one non-zero digit stays to its left (giving 2.1), then count the 1 place you moved it — that is the exponent 1. So 21 = 2.1 × 10¹.