Number
12,721
12,721 is a prime, odd.
Properties
- Parity
- Odd
- Digit count
- 5
- Digit sum
- 13
- Digit product
- 28
- Digital root
- 4
- Palindrome
- Yes
- Bit width
- 14 bits
- Recamán's sequence
- a(48,833) = 12,721
- Square (n²)
- 161,823,841
- Cube (n³)
- 2,058,561,081,361
- Divisor count
- 2
- σ(n) — sum of divisors
- 12,722
- φ(n) — Euler's totient
- 12,720
Primality
12,721 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:
20² + 111²
As consecutive integers:
6,360 + 6,361
Representations
- In words
- twelve thousand seven hundred twenty-one
- Ordinal
- 12721st
- Binary
- 11000110110001
- Octal
- 30661
- Hexadecimal
- 0x31B1
- Base64
- MbE=
- One's complement
- 52,814 (16-bit)
In other bases
ternary (3)
122110011
quaternary (4)
3012301
quinary (5)
401341
senary (6)
134521
septenary (7)
52042
nonary (9)
18404
undecimal (11)
9615
duodecimal (12)
7441
tridecimal (13)
5a37
tetradecimal (14)
48c9
pentadecimal (15)
3b81
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹 𒁹
- Egyptian hieroglyphic
- 𓂍𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓏺
- Greek (Milesian)
- ͵ιβψκαʹ
- Mayan (base 20)
- 𝋡·𝋫·𝋰·𝋡
- Chinese
- 一萬二千七百二十一
- Chinese (financial)
- 壹萬貳仟柒佰貳拾壹
In other modern scripts
Eastern Arabic
١٢٧٢١
Devanagari
१२७२१
Bengali
১২৭২১
Tamil
௧௨௭௨௧
Thai
๑๒๗๒๑
Tibetan
༡༢༧༢༡
Khmer
១២៧២១
Lao
໑໒໗໒໑
Burmese
၁၂၇၂၁
Digit at this position in famous constants
- π — Pi (π)
- Digit 12,721 = 1
- e — Euler's number (e)
- Digit 12,721 = 1
- φ — Golden ratio (φ)
- Digit 12,721 = 0
- √2 — Pythagoras's (√2)
- Digit 12,721 = 2
- ln 2 — Natural log of 2
- Digit 12,721 = 9
- γ — Euler-Mascheroni (γ)
- Digit 12,721 = 9
Also seen as
Unicode codepoint
ㆱ
Bopomofo Letter Om
U+31B1
Other letter (Lo)
UTF-8 encoding: E3 86 B1 (3 bytes).
Hex color
#0031B1
RGB(0, 49, 177)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.49.177.
- Address
- 0.0.49.177
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.49.177
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Position in π
The digit sequence 12721 first appears in π at position 54,516 of the decimal expansion (the 54,516ordinal-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.