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The centyllion is equal to $$10^{2^{102}} = 10^{5,070,602,400,912,917,605,986,812,821,504}$$ in the myriad system, or 10 squared 102 times.[1][2] It is equal to one followed by 2102 (or approx. 5 nonillion) zeros. It is 2102+1 digits long.

In the Knuth-Pelletier -yllion system, centyllion is equal to 103,213,876,088,517,980,551,083,924,184,682,325,205,044,405,987,565,585,670,602,752 which is equal to novemnonaginticentyllion in the normal -yllion system.

## Names in -illion systems

In the short scale, it is also called:

According to Landon Curt Noll's The English name of a number, is also known as:

## Approximations in other notations

Notation Lower bound Upper bound
Scientific notation $$10^{5.070602 \times 10^{30}}$$
Arrow notation $$10\uparrow2\uparrow102$$
Down-arrow notation $$564\downarrow\downarrow12$$ $$565\downarrow\downarrow12$$
Steinhaus-Moser Notation 21[3][3] 22[3][3]
Copy notation 4[4[31]] 5[5[31]]
H* function H(H(9)) H(2H(9))
Taro's multivariable Ackermann function A(3,A(3,100)) A(3,A(3,101))
Pound-Star Notation #*((1))*(2,0,10)*4 #*((1))*(5,2)*9
BEAF {10,{2,102}}
Hyper-E notation EE[2]102
Bashicu matrix system (0)(1)[10]
Hyperfactorial array notation (27!)! (28!)!
Fast-growing hierarchy $$f_2(f_2(96))$$ $$f_2(f_2(97))$$
Hardy hierarchy $$H_{\omega^22}(96)$$ $$H_{\omega^22}(97)$$
Slow-growing hierarchy $$g_{\omega^{\omega^{\omega3}5}}(10)$$ $$g_{\omega^{\omega^{\omega3}6}}(10)$$