"Heptillion" redirects here. It is not to be confused with hepillion.

A sextillion is equal to 1021 in short scale, or 1036 in long scale.

It is 22 digits long in short scale, or 37 digits long in long scale.

Written out in decimal form sextillion (in the short scale) is:

1000000000000000000000

In long scale:

1000000000000000000000000000000000000

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.

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

Wikia user NumLynx gave the name septasand for this number's short scale value.

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

## Decimal

• 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

• 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.
• You could fit 615 earths in a flat layer with an area of one sextillion square centimeters.
• The SI prefix zetta- multiplies by one short-scale sextillion.
• There are 1 sextillion grains of sand on Earth.
• There are about 1 sextillion atoms in the body of a flea.

## As a banknote denomination

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

For short scale:

Notation Lower bound Upper bound
Scientific notation $$1\times10^{21}$$
Arrow notation $$10\uparrow21$$
Steinhaus-Moser Notation 17 18
Copy notation 9 10
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) (0)(0)(0)
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 26
Copy notation 9 1
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) (0)(0)(0)
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 $$g_{\omega^{\omega3+6}}(10)$$