| 1212121 | ||
|---|---|---|
| < 1212120 | ||
| 1212122 > | ||
1212121 is the number following 1212120 and preceding 1212122.
Properties
- It is the 93774th prime number.[1][2][3]
- 1212121 is an odd number[4][5] .
- 1212121 is an unhappy number.[6][7]
- 1212121 is deficient.[8]
- 1212121 is a palindromic number, meaning it is the same forwards and reverse.[9][10]
Approximations
| Notation | Lower bound | Upper bound | |
|---|---|---|---|
| Up-arrow notation | 1101 ↑ 2 | ||
| Scientific notation | 1.212 x 106 | ||
| Slow-growing hierarchy | \(g_{\omega^{\omega}}(7)\) | \(g_{\omega^{\omega}}(8)\) | |
| Chained arrow notation | 1101 → 2 | ||
| Bowers' Exploding Array Function/Bird's array notation | {1101,2} | ||
| Hardy hierarchy | Hω(606060) | Hω(606061) | |
| Middle-growing hierarchy | m(ω,20) | ||
| Hyper-E notation | E6.0835 | ||
| Hyper-E notation (non-10 base) | \(E[1101]2\) | ||
| X-Sequence Hyper-Exponential Notation | 1101{1}2 | ||
| PlantStar's Debut Notation | [3] | [4] | |
| H* function | H(1) | H(1.1) | |
| Bashicu matrix system with respect to version 4 | (0)[1100] | (0)[1101] | |
Sources
- ↑ OEIS A000040 - Primes
- ↑ Wolfram Alpha Is 1212121 prime?
- ↑ Wolfram Alpha 1212121's factors
- ↑ OEIS A005408 - Odd numbers
- ↑ Wolfram Alpha Is 1212121 odd?
- ↑ Wolfram Alpha Unhappy Numbers
- ↑ OEIS A031177 - Unhappy Numbers
- ↑ OEIS A005100 - Deficient numbers
- ↑ Wolfram Alpha Is 1212121 a palindrome?
- ↑ OEIS A002113 - Palindromes