# 216821

## 216,821 is an odd composite number composed of three prime numbers multiplied together.

What does the number 216821 look like?

This visualization shows the relationship between its 3 prime factors (large circles) and 8 divisors.

216821 is an odd composite number. It is composed of three distinct prime numbers multiplied together. It has a total of eight divisors.

## Prime factorization of 216821:

### 11 × 23 × 857

See below for interesting mathematical facts about the number 216821 from the Numbermatics database.

### Names of 216821

• Cardinal: 216821 can be written as Two hundred sixteen thousand, eight hundred twenty-one.

### Scientific notation

• Scientific notation: 2.16821 × 105

### Factors of 216821

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 891

### Divisors of 216821

• Number of divisors d(n): 8
• Complete list of divisors:
• Sum of all divisors σ(n): 247104
• Sum of proper divisors (its aliquot sum) s(n): 30283
• 216821 is a deficient number, because the sum of its proper divisors (30283) is less than itself. Its deficiency is 186538

### Bases of 216821

• Binary: 1101001110111101012
• Base-36: 4NAT

### Squares and roots of 216821

• 216821 squared (2168212) is 47011346041
• 216821 cubed (2168213) is 10193047059955661
• The square root of 216821 is 465.6404192079
• The cube root of 216821 is 60.0759224077

### Scales and comparisons

How big is 216821?
• 216,821 seconds is equal to 2 days, 12 hours, 13 minutes, 41 seconds.
• To count from 1 to 216,821 would take you about two days.

This is a very rough estimate, based on a speaking rate of half a second every third order of magnitude. If you speak quickly, you could probably say any randomly-chosen number between one and a thousand in around half a second. Very big numbers obviously take longer to say, so we add half a second for every extra x1000. (We do not count involuntary pauses, bathroom breaks or the necessity of sleep in our calculation!)

• A cube with a volume of 216821 cubic inches would be around 5 feet tall.

### Recreational maths with 216821

• 216821 backwards is 128612
• The number of decimal digits it has is: 6
• The sum of 216821's digits is 20
• More coming soon!