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The uttaraparamanurajahpravesa is equal to $$10^{421}$$.[1] It's also equal to ten noventrigintacentillion.[2]

## Approximations

Notation Lower bound Upper bound
Scientific notation $$1\times10^{421}$$
Arrow notation $$10\uparrow421$$
Steinhaus-Moser Notation 185[3] 186[3]
Copy notation 9[421] 10[211]
Taro's multivariable Ackermann function A(3,1395) A(3,1396)
Pound-Star Notation #*((43))*13 #*((44))*13
BEAF {10,421}
Hyper-E notation E421
Bashicu matrix system (0)(0)(0)(0)(0)(0)(0)[1945] (0)(0)(0)(0)(0)(0)(0)[1946]
Hyperfactorial array notation 219! 220!
Fast-growing hierarchy $$f_2(1388)$$ $$f_2(1389)$$
Hardy hierarchy $$H_{\omega^2}(1388)$$ $$H_{\omega^2}(1389)$$
Slow-growing hierarchy $$g_{\omega^{\omega^24+\omega2+1}}(10)$$

## Sources

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Other: Taro's multivariable Ackermann function · TR function · Arai's $$\psi$$ · Sushi Kokuu Hen

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