Number
21,023
21,023 is a prime, odd.
Properties
- Parity
- Odd
- Digit count
- 5
- Digit sum
- 8
- Digit product
- 0
- Digital root
- 8
- Palindrome
- No
- Bit width
- 15 bits
- Reversed
- 32,012
- Recamán's sequence
- a(41,793) = 21,023
- Square (n²)
- 441,966,529
- Cube (n³)
- 9,291,462,339,167
- Divisor count
- 2
- σ(n) — sum of divisors
- 21,024
- φ(n) — Euler's totient
- 21,022
Primality
21,023 is prime. It has exactly two divisors: 1 and itself.
Divisors & multiples
Aliquot sum (sum of proper divisors):
1
First multiples
21,023
·
42,046
(double)
·
63,069
·
84,092
·
105,115
·
126,138
·
147,161
·
168,184
·
189,207
·
210,230
Sums & aliquot sequence
As consecutive integers:
10,511 + 10,512
Representations
- In words
- twenty-one thousand twenty-three
- Ordinal
- 21023rd
- Binary
- 101001000011111
- Octal
- 51037
- Hexadecimal
- 0x521F
- Base64
- Uh8=
- One's complement
- 44,512 (16-bit)
In other bases
ternary (3)
1001211122
quaternary (4)
11020133
quinary (5)
1133043
senary (6)
241155
septenary (7)
115202
nonary (9)
31748
undecimal (11)
14882
duodecimal (12)
101bb
tridecimal (13)
9752
tetradecimal (14)
7939
pentadecimal (15)
6368
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋 𒌋𒌋𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓂍𓂍𓆼𓎆𓎆𓏺𓏺𓏺
- Greek (Milesian)
- ͵κακγʹ
- Mayan (base 20)
- 𝋢·𝋬·𝋫·𝋣
- Chinese
- 二萬一千零二十三
- Chinese (financial)
- 貳萬壹仟零貳拾參
In other modern scripts
Eastern Arabic
٢١٠٢٣
Devanagari
२१०२३
Bengali
২১০২৩
Tamil
௨௧௦௨௩
Thai
๒๑๐๒๓
Tibetan
༢༡༠༢༣
Khmer
២១០២៣
Lao
໒໑໐໒໓
Burmese
၂၁၀၂၃
Digit at this position in famous constants
- π — Pi (π)
- Digit 21,023 = 1
- e — Euler's number (e)
- Digit 21,023 = 1
- φ — Golden ratio (φ)
- Digit 21,023 = 6
- √2 — Pythagoras's (√2)
- Digit 21,023 = 3
- ln 2 — Natural log of 2
- Digit 21,023 = 2
- γ — Euler-Mascheroni (γ)
- Digit 21,023 = 7
Also seen as
Prime neighborhood
Unicode codepoint
刟
CJK Unified Ideograph-521F
U+521F
Other letter (Lo)
UTF-8 encoding: E5 88 9F (3 bytes).
Hex color
#00521F
RGB(0, 82, 31)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.82.31.
- Address
- 0.0.82.31
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.82.31
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Position in π
The digit sequence 21023 first appears in π at position 123,006 of the decimal expansion (the 123,006ordinal-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.