Live analysis
21,007
21,007 is a composite number, odd.
This number doesn't have a permanent NumberWiki page yet — what you see below is computed live.
Pages get added to the permanent index when they're notable (years, primes, curated, etc.).
Properties
- Parity
- Odd
- Digit count
- 5
- Digit sum
- 10
- Digit product
- 0
- Digital root
- 1
- Palindrome
- No
- Bit width
- 15 bits
- Reversed
- 70,012
- Recamán's sequence
- a(41,825) = 21,007
- Square (n²)
- 441,294,049
- Cube (n³)
- 9,270,264,087,343
- Divisor count
- 4
- σ(n) — sum of divisors
- 24,016
- φ(n) — Euler's totient
- 18,000
- Sum of prime factors
- 3,008
Primality
Prime factorization: 7 × 3001
Divisors & multiples
Aliquot sum (sum of proper divisors):
3,009
First multiples
21,007
·
42,014
(double)
·
63,021
·
84,028
·
105,035
·
126,042
·
147,049
·
168,056
·
189,063
·
210,070
Sums & aliquot sequence
As consecutive integers:
10,503 + 10,504
2,998 + 2,999 + … + 3,004
1,494 + 1,495 + … + 1,507
Aliquot sequence:
21,007 → 3,009 → 1,311 → 609 → 351 → 209 → 31 → 1 → 0
— terminates at zero
Representations
- In words
- twenty-one thousand seven
- Ordinal
- 21007th
- Binary
- 101001000001111
- Octal
- 51017
- Hexadecimal
- 0x520F
- Base64
- Ug8=
- One's complement
- 44,528 (16-bit)
In other bases
ternary (3)
1001211001
quaternary (4)
11020033
quinary (5)
1133012
senary (6)
241131
septenary (7)
115150
nonary (9)
31731
undecimal (11)
14868
duodecimal (12)
101a7
tridecimal (13)
973c
tetradecimal (14)
7927
pentadecimal (15)
6357
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋 𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓂍𓂍𓆼𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵καζʹ
- Mayan (base 20)
- 𝋢·𝋬·𝋪·𝋧
- Chinese
- 二萬一千零七
- Chinese (financial)
- 貳萬壹仟零柒
In other modern scripts
Eastern Arabic
٢١٠٠٧
Devanagari
२१००७
Bengali
২১০০৭
Tamil
௨௧௦௦௭
Thai
๒๑๐๐๗
Tibetan
༢༡༠༠༧
Khmer
២១០០៧
Lao
໒໑໐໐໗
Burmese
၂၁၀၀၇
Digit at this position in famous constants
- π — Pi (π)
- Digit 21,007 = 4
- e — Euler's number (e)
- Digit 21,007 = 8
- φ — Golden ratio (φ)
- Digit 21,007 = 0
- √2 — Pythagoras's (√2)
- Digit 21,007 = 6
- ln 2 — Natural log of 2
- Digit 21,007 = 0
- γ — Euler-Mascheroni (γ)
- Digit 21,007 = 1
Also seen as
Unicode codepoint
刏
CJK Unified Ideograph-520F
U+520F
Other letter (Lo)
UTF-8 encoding: E5 88 8F (3 bytes).
Hex color
#00520F
RGB(0, 82, 15)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.82.15.
- Address
- 0.0.82.15
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.82.15
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Position in π
The digit sequence 21007 first appears in π at position 76,431 of the decimal expansion (the 76,431ordinal-suffix:st 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.