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A sextillion is equal to 1021 in America, or 1036 in France and Germany.[1]

In the long scale, 1021 is called trilliard, which is commonly used in France and Germany.

This number is also called heptillion in Russ Rowlett's Greek-based naming system.[2]

Aarex Tiaokhiao gave the name heptillion, referring to the value of this number.[3]

It is the smallest -illion number whose successor isn't squarefree.[4]

## Decimal Edit

• 1,000,000,000,000,000,000,000 - short scale
• 1,000,000,000,000,000,000,000,000,000,000,000,000 - long scale

## Examples Edit

• The volume of the earth is about 1.085 sextillion cubic meters.
• The earth has a mass of about 5.98 sextillion metric tons.
• There are about 6 sextillion cups of water in all the oceans of the world.
• The distance between one end of the universe and the other may be about 87.9 sextillion miles or 141 sextillion kilometers.[5]
• You could fit 615 earths in a flat layer with an area of one sextillion square centimeters.[6]
• The SI prefix zetta- multiplies by one short-scale sextillion.

## As a banknote denomination Edit

Only the Hungarian pengő had banknotes with this number in the denomination, but they were never issued; in fact, it was the highest banknote denomination ever printed.

## Approximations Edit

For short scale:

Notation Lower bound Upper bound
Scientific notation $$1\times10^{21}$$
Arrow notation $$10\uparrow21$$
Steinhaus-Moser Notation 17[3] 18[3]
Copy notation 9[21] 10[11]
Taro's multivariable Ackermann function A(3,66) A(3,67)
Pound-Star Notation #*(100)*10
BEAF {10,21}
Hyper-E notation E21
Bashicu matrix system (0)(0)(0)[421] (0)(0)(0)[422]
Hyperfactorial array notation 21! 22!
Fast-growing hierarchy $$f_2(63)$$ $$f_2(64)$$
Hardy hierarchy $$H_{\omega^2}(63)$$ $$H_{\omega^2}(64)$$
Slow-growing hierarchy $$g_{\omega^{\omega2+1}}(10)$$

For long scale:

Notation Lower bound Upper bound
Scientific notation $$1\times10^{36}$$
Arrow notation $$10\uparrow36$$
Steinhaus-Moser Notation 25[3] 26[3]
Copy notation 9[36] 1[37]
Taro's multivariable Ackermann function A(3,116) A(3,117)
Pound-Star Notation #*(3,7,1,0,1)*6 #*(2,6,1,3,4)*5
BEAF {10,36}
Hyper-E notation E36
Bashicu matrix system (0)(0)(0)[31622] (0)(0)(0)[31623]
Hyperfactorial array notation 32! 33!
Fast-growing hierarchy $$f_2(112)$$ $$f_2(113)$$
Hardy hierarchy $$H_{\omega^2}(112)$$ $$H_{\omega^2}(113)$$
Slow-growing hierarchy $$g_{\omega^{\omega3+6}}(10)$$