| Base | Representation |
|---|---|
| bin | 101000100000… |
| … | …1111010011100 |
| 3 | 1110222011212020 |
| 4 | 1101001322130 |
| 5 | 20414212000 |
| 6 | 2035140140 |
| 7 | 345356400 |
| oct | 121017234 |
| 9 | 43864766 |
| 10 | 21241500 |
| 11 | 10a99065 |
| 12 | 7144650 |
| 13 | 4529547 |
| 14 | 2b6d100 |
| 15 | 1ce8ba0 |
| hex | 1441e9c |
21241500 has 216 divisors, whose sum is σ = 76435632. Its totient is φ = 4569600.
The previous prime is 21241477. The next prime is 21241501. The reversal of 21241500 is 514212.
It is a Harshad number since it is a multiple of its sum of digits (15).
It is a self number, because there is not a number n which added to its sum of digits gives 21241500.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (21241501) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1249492 + ... + 1249508.
Almost surely, 221241500 is an apocalyptic number.
21241500 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 21241500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38217816).
21241500 is an abundant number, since it is smaller than the sum of its proper divisors (55194132).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21241500 is a wasteful number, since it uses less digits than its factorization.
21241500 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 70 (or 34 counting only the distinct ones).
The product of its (nonzero) digits is 80, while the sum is 15.
The square root of 21241500 is about 4608.8501819868. The cubic root of 21241500 is about 276.9459768574.
Multiplying 21241500 by its sum of digits (15), we get a square (318622500 = 178502).
21241500 divided by its sum of digits (15) gives a square (1416100 = 11902).
Adding to 21241500 its reverse (514212), we get a palindrome (21755712).
The spelling of 21241500 in words is "twenty-one million, two hundred forty-one thousand, five hundred".
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