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"Dudoocol" redirects here. It is not to be confused with dooducol.

A trillion is equal to 1012 in the short scale, or 1018 in the long scale.

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

1000000000000

In long scale:

1000000000000000000

This number is also called tetrillion in Russ Rowlett's Greek-based naming system.

Aarex Tiaokhiao gave the name tetillion, referring to the value of this number. He also calls 1012 dudoocol, 12-noogol, or goonaoldecault, and it's equal to a(10,100,0)x in Aarex's Array Notation.

Username5243 gave the name niloogolnoniplex, referring to the short scale value of this number.

It is also the first -illion to exceed 1010 in the short scale.

It is equal to 1 million squared in the short scale and 1 million cubed in the long scale.

## Examples

• The nearest star to the Earth (besides the sun), Alpha Centauri, is over 26 trillion miles away or 41.842 trillion kilometers away.
• The human body contains somewhere around 50 trillion cells.
• There are roughly 3,500,000,000,000 fish in the world.
• The SI prefix tera- multiplies by one trillion.
• If one sandcastle contains one million grains of sand then you could make one million sandcastles with 1 trillion grains of sand.
• 1 trillion flops or operations per second is called a teraflop.
• A 2016 estimate says there are 2,000,000,000,000 galaxies in the observable universe.
• An estimate says there were 3.04 × 1012 trees on Earth in 2015.
• Andromeda Galaxy, which is part of the same Local Group as our galaxy, contains about 1012 stars.
• The surface of the human body houses roughly 1012 bacteria.
• 1.9786782 × 1012 is a rough estimate of the total number of links on Wikipedia.
• 1013 (ten Trillion)– The approximate number of known non-trivial zeros of the Riemann zeta function as of 2004.
• As of 2021, the number of known digits of π is 50,000,000,000,000 (5×1013).
• Approximately 1014 (one hundred Trillion) synapses in the human brain.
• 281,474,976,710,656 (248) possible unique physical addresses on MAC-48.
• 953,467,954,114,363 is the largest known Motzkin prime.

## As a banknote denomination

Some currencies, such as the German Papiermark and the Hungarian pengő, had banknotes with this number in the denomination.

## Approximations

For short scale:

Notation Lower bound Upper bound
Scientific notation $$1\times10^{12}$$
Arrow notation $$10\uparrow12$$
Steinhaus-Moser Notation 11 12
Copy notation 9 1
Chained arrow notation $$10\rightarrow12$$
Taro's multivariable Ackermann function A(3,36) A(3,37)
Pound-Star Notation #*(4,2,3)*4 #*(1,2)*8
BEAF & Bird's array notation {10,12}
Hyper-E notation E12
Bashicu matrix system (0)(0)
Hyperfactorial array notation 14! 15!
Fast-growing hierarchy $$f_2(34)$$ $$f_2(35)$$
Hardy hierarchy $$H_{\omega^2}(34)$$ $$H_{\omega^2}(35)$$
Slow-growing hierarchy $$g_{\omega^{\omega+2}}(10)$$

For long scale:

Notation Lower bound Upper bound
Scientific notation $$1\times10^{18}$$
Arrow notation $$10\uparrow18$$
Steinhaus-Moser Notation 15 16
Copy notation 9 1
Chained arrow notation $$10\rightarrow18$$
Taro's multivariable Ackermann function A(3,56) A(3,57)
Pound-Star Notation #*(4,1,3)*6 #*(3,1)*13
BEAF & Bird's array notation {10,18}
Hyper-E notation E18
Bashicu matrix system (0)(0) (0)(0)
Hyperfactorial array notation 19! 20!
Fast-growing hierarchy $$f_2(54)$$ $$f_2(55)$$
Hardy hierarchy $$H_{\omega^2}(54)$$ $$H_{\omega^2}(55)$$
Slow-growing hierarchy $$g_{\omega^{\omega+8}}(10)$$