Zeptekillillion

The zeptekillillion is equal to \(10^{3\left(10^{21,000}\right)+3}\).Sbiis Saibian's large numbers site The term was coined by Sbiis Saibian.
==Approximations==
Notation 	Lower bound 	Upper bound
Arrow notation 	\(1000\uparrow(1+10\uparrow21000)\) 	\(1000\uparrow(1+10\uparrow21000)\)
Down-arrow notation 	\(1000\downarrow\downarrow7001\) 	\(96\downarrow\downarrow10595\)
Steinhaus-Moser Notation 	5[3][3][3] 	6[3][3][3]
Copy notation 	2[2[21001]] 	3[3[21001]]
H* function 	H(H(6999)) 	H(H(6999))
Taro's multivariable Ackermann function	A(3,A(3,69760)) 	A(3,A(3,69761))
Pound-Star Notation 	#*((1))*((70))*53 	#*((1))*((71))*53
BEAF 	{1000,1+{10,21000}} 	{1000,1+{10,21000}}
Hyper-E notation 	E(3+3E21000) 	E(3+3E21000)
Bashicu matrix system 	(0)(1)[264] 	(0)(1)[265]
Hyperfactorial array notation 	((7!)!)! 	((8!)!)!
Fast-growing hierarchy 	\(f_2^3(12)\) 	\(f_2^3(13)\)
Hardy hierarchy 	\(H_{\omega^23}(12)\) 	\(H_{\omega^23}(13)\)
Slow-growing hierarchy 	\(g_{\omega^{\omega^{\omega^42+\omega^3}3+3}}(10)\)	\(g_{\omega^{\omega^{\omega^42+\omega^3}3+3}}(10)\)
==Sources==
Category: Tier 3 -illion numbers
Category:Numbers
Category:Numbers by Sbiis Saibian
Category:Illion
Category:Class 3
Category:Upper class 3