Number
12,821
12,821 is a prime, odd.
Properties
- Parity
- Odd
- Digit count
- 5
- Digit sum
- 14
- Digit product
- 32
- Digital root
- 5
- Palindrome
- Yes
- Bit width
- 14 bits
- Recamán's sequence
- a(48,633) = 12,821
- Square (n²)
- 164,378,041
- Cube (n³)
- 2,107,490,863,661
- Divisor count
- 2
- σ(n) — sum of divisors
- 12,822
- φ(n) — Euler's totient
- 12,820
Primality
12,821 is prime. It has exactly two divisors: 1 and itself.
Divisors & multiples
Aliquot sum (sum of proper divisors):
1
First multiples
Sums & aliquot sequence
As a sum of two squares:
70² + 89²
As consecutive integers:
6,410 + 6,411
Representations
- In words
- twelve thousand eight hundred twenty-one
- Ordinal
- 12821st
- Binary
- 11001000010101
- Octal
- 31025
- Hexadecimal
- 0x3215
- Base64
- MhU=
- One's complement
- 52,714 (16-bit)
In other bases
ternary (3)
122120212
quaternary (4)
3020111
quinary (5)
402241
senary (6)
135205
septenary (7)
52244
nonary (9)
18525
undecimal (11)
96a6
duodecimal (12)
7505
tridecimal (13)
5ab3
tetradecimal (14)
495b
pentadecimal (15)
3beb
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹
- Egyptian hieroglyphic
- 𓂍𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓏺
- Greek (Milesian)
- ͵ιβωκαʹ
- Mayan (base 20)
- 𝋡·𝋬·𝋡·𝋡
- Chinese
- 一萬二千八百二十一
- Chinese (financial)
- 壹萬貳仟捌佰貳拾壹
In other modern scripts
Eastern Arabic
١٢٨٢١
Devanagari
१२८२१
Bengali
১২৮২১
Tamil
௧௨௮௨௧
Thai
๑๒๘๒๑
Tibetan
༡༢༨༢༡
Khmer
១២៨២១
Lao
໑໒໘໒໑
Burmese
၁၂၈၂၁
Digit at this position in famous constants
- π — Pi (π)
- Digit 12,821 = 2
- e — Euler's number (e)
- Digit 12,821 = 0
- φ — Golden ratio (φ)
- Digit 12,821 = 9
- √2 — Pythagoras's (√2)
- Digit 12,821 = 4
- ln 2 — Natural log of 2
- Digit 12,821 = 1
- γ — Euler-Mascheroni (γ)
- Digit 12,821 = 0
Also seen as
Prime neighborhood
Unicode codepoint
㈕
Parenthesized Hangul Ieung A
U+3215
Other symbol (So)
UTF-8 encoding: E3 88 95 (3 bytes).
Hex color
#003215
RGB(0, 50, 21)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.50.21.
- Address
- 0.0.50.21
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.50.21
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Position in π
The digit sequence 12821 first appears in π at position 97,930 of the decimal expansion (the 97,930ordinal-suffix:th digit after the integer 3).
Search range: the first 1,000,000 fractional digits of π. Any 6-digit-or-shorter string is virtually guaranteed to appear in there — the more interesting signal is the position.