Base | Representation |
---|---|
bin | 10011100110010010… |
… | …110001110000001000 |
3 | 2000022120011011102200 |
4 | 103212102301300020 |
5 | 321044122114430 |
6 | 13400044200200 |
7 | 1343323143225 |
oct | 234622616010 |
9 | 60276134380 |
10 | 21043551240 |
11 | 8a19599568 |
12 | 40b3539060 |
13 | 1ca4952b8a |
14 | 1038b2c94c |
15 | 8326a1460 |
hex | 4e64b1c08 |
21043551240 has 192 divisors, whose sum is σ = 69856300800. Its totient is φ = 5492275200.
The previous prime is 21043551233. The next prime is 21043551301. The reversal of 21043551240 is 4215534012.
21043551240 is a `hidden beast` number, since 2 + 104 + 3 + 5 + 512 + 40 = 666.
It is an unprimeable number.
It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5116785 + ... + 5120895.
It is an arithmetic number, because the mean of its divisors is an integer number (363834900).
Almost surely, 221043551240 is an apocalyptic number.
21043551240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 21043551240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34928150400).
21043551240 is an abundant number, since it is smaller than the sum of its proper divisors (48812749560).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21043551240 is a wasteful number, since it uses less digits than its factorization.
21043551240 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 4428 (or 4421 counting only the distinct ones).
The product of its (nonzero) digits is 4800, while the sum is 27.
The spelling of 21043551240 in words is "twenty-one billion, forty-three million, five hundred fifty-one thousand, two hundred forty".
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