Base | Representation |
---|---|
bin | 1011111010111… |
… | …10000100010101 |
3 | 20222011112020111 |
4 | 11331132010111 |
5 | 201100000041 |
6 | 13531203021 |
7 | 2322662152 |
oct | 575360425 |
9 | 228145214 |
10 | 100000021 |
11 | 514a1550 |
12 | 295a6471 |
13 | 17943814 |
14 | d3d1229 |
15 | 8ba4981 |
hex | 5f5e115 |
100000021 has 32 divisors (see below), whose sum is σ = 121927680. Its totient is φ = 80942400.
The previous prime is 100000007. The next prime is 100000037. The reversal of 100000021 is 120000001.
It is not a de Polignac number, because 100000021 - 25 = 99999989 is a prime.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (100000081) by changing a digit.
It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 341151 + ... + 341443.
It is an arithmetic number, because the mean of its divisors is an integer number (3810240).
Almost surely, 2100000021 is an apocalyptic number.
100000021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.
It is an amenable number.
100000021 is a deficient number, since it is larger than the sum of its proper divisors (21927659).
100000021 is a wasteful number, since it uses less digits than its factorization.
100000021 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 417.
The product of its (nonzero) digits is 2, while the sum is 4.
The square root of 100000021 is about 10000.0010499999. The cubic root of 100000021 is about 464.1589158524.
Adding to 100000021 its reverse (120000001), we get a palindrome (220000022).
The spelling of 100000021 in words is "one hundred million, twenty-one", and thus it is an aban number.
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