121,821
121,821 is a composite number, odd.
121,821 (one hundred twenty-one thousand eight hundred twenty-one) is an odd 6-digit number. It is a composite number with 8 divisors, and factors as 3 × 7 × 5,801. Written other ways, in hexadecimal, 0x1DBDD.
Interestingness
Properties
- Parity
- Odd
- Digit count
- 6
- Digit sum
- 15
- Digit product
- 32
- Digital root
- 6
- Palindrome
- No
- Bit width
- 17 bits
- Reversed
- 128,121
- Square (n²)
- 14,840,356,041
- Cube (n³)
- 1,807,867,013,270,661
- Divisor count
- 8
- σ(n) — sum of divisors
- 185,664
- φ(n) — Euler's totient
- 69,600
- Sum of prime factors
- 5,811
Primality
Prime factorization: 3 × 7 × 5801
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√121,821 = [349; (34, 1, 9, 6, 1, 7, 2, 1, 4, 1, 9, 2, 3, 1, 3, 1, 1, 3, 1, 2, 1, 1, 1, 1, …)]
Period length 52 — the block in parentheses repeats forever.
Representations
- In words
- one hundred twenty-one thousand eight hundred twenty-one
- Ordinal
- 121821st
- Binary
- 11101101111011101
- Octal
- 355735
- Hexadecimal
- 0x1DBDD
- Base64
- Advd
- One's complement
- 4,294,845,474 (32-bit)
- Scientific notation
- 1.21821 × 10⁵
- As a duration
- 121,821 s = 1 day, 9 hours, 50 minutes, 21 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋 𒌋𒌋𒁹
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓏺
- Greek (Milesian)
- ͵ρκαωκαʹ
- Mayan (base 20)
- 𝋯·𝋤·𝋫·𝋡
- Chinese
- 一十二萬一千八百二十一
- Chinese (financial)
- 壹拾貳萬壹仟捌佰貳拾壹
Also seen as
As an unsigned 32-bit integer, this is the IPv4 address 0.1.219.221.
- Address
- 0.1.219.221
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.1.219.221
Unspecified address (0.0.0.0/8) — "this network" placeholder.
This number falls in the range of US utility patent numbers. If it's a patent, it would be issued as US 121,821 and was likely granted around 1871.
Patent numbers below 100,000 are excluded as too ambiguous; modern numbering currently reaches roughly 12.5 million.
The digit sequence 121821 first appears in π at position 603,257 of the decimal expansion (the 603,257ordinal-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.
Related reading
- Babylonian numerals — The base-60 cuneiform system that gave us 60 minutes, 60 seconds, and 360°.