Number
21,013
21,013 is a prime, odd.
Properties
- Parity
- Odd
- Digit count
- 5
- Digit sum
- 7
- Digit product
- 0
- Digital root
- 7
- Palindrome
- No
- Bit width
- 15 bits
- Reversed
- 31,012
- Recamán's sequence
- a(41,813) = 21,013
- Square (n²)
- 441,546,169
- Cube (n³)
- 9,278,209,649,197
- Divisor count
- 2
- σ(n) — sum of divisors
- 21,014
- φ(n) — Euler's totient
- 21,012
Primality
21,013 is prime. It has exactly two divisors: 1 and itself.
Divisors & multiples
Aliquot sum (sum of proper divisors):
1
First multiples
21,013
·
42,026
(double)
·
63,039
·
84,052
·
105,065
·
126,078
·
147,091
·
168,104
·
189,117
·
210,130
Sums & aliquot sequence
As a sum of two squares:
102² + 103²
As consecutive integers:
10,506 + 10,507
Representations
- In words
- twenty-one thousand thirteen
- Ordinal
- 21013th
- Binary
- 101001000010101
- Octal
- 51025
- Hexadecimal
- 0x5215
- Base64
- UhU=
- One's complement
- 44,522 (16-bit)
In other bases
ternary (3)
1001211021
quaternary (4)
11020111
quinary (5)
1133023
senary (6)
241141
septenary (7)
115156
nonary (9)
31737
undecimal (11)
14873
duodecimal (12)
101b1
tridecimal (13)
9745
tetradecimal (14)
792d
pentadecimal (15)
635d
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋 𒌋𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓂍𓂍𓆼𓎆𓏺𓏺𓏺
- Greek (Milesian)
- ͵καιγʹ
- Mayan (base 20)
- 𝋢·𝋬·𝋪·𝋭
- Chinese
- 二萬一千零一十三
- Chinese (financial)
- 貳萬壹仟零壹拾參
In other modern scripts
Eastern Arabic
٢١٠١٣
Devanagari
२१०१३
Bengali
২১০১৩
Tamil
௨௧௦௧௩
Thai
๒๑๐๑๓
Tibetan
༢༡༠༡༣
Khmer
២១០១៣
Lao
໒໑໐໑໓
Burmese
၂၁၀၁၃
Digit at this position in famous constants
- π — Pi (π)
- Digit 21,013 = 5
- e — Euler's number (e)
- Digit 21,013 = 9
- φ — Golden ratio (φ)
- Digit 21,013 = 5
- √2 — Pythagoras's (√2)
- Digit 21,013 = 0
- ln 2 — Natural log of 2
- Digit 21,013 = 1
- γ — Euler-Mascheroni (γ)
- Digit 21,013 = 8
Also seen as
Prime neighborhood
Unicode codepoint
刕
CJK Unified Ideograph-5215
U+5215
Other letter (Lo)
UTF-8 encoding: E5 88 95 (3 bytes).
Hex color
#005215
RGB(0, 82, 21)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.82.21.
- Address
- 0.0.82.21
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.82.21
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Position in π
The digit sequence 21013 first appears in π at position 321,292 of the decimal expansion (the 321,292ordinal-suffix:nd 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.