Zettagross is equal to 14421 = 2,116,471,057,875,484,488,839,167,999,221,661,362,284,396,544. The term was coined by Instrumentalism.[1]


Notation Lower bound Upper bound
Scientific notation \(2.11647105\times10^{45}\) \(2.11647105\times10^{45}\)
Arrow notation \(12\uparrow42\)
Chained arrow notation \(12\rightarrow42\)
Steinhaus-Moser Notation 30[3] 31[3]
Copy notation 2[46] 3[46]
BEAF {12,42}
Strong array notation s(12,42)
Hyperfactorial array notation 38! 39!
Fast-growing hierarchy \(f_2(144)\) \(f_2(145)\)
Hardy hierarchy \(H_{\omega^2}(145)\) \(H_{\omega^2}(145)\)
Slow-growing hierarchy \(g_{\omega^{42 }}(12)\)


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