Base | Representation |
---|---|
bin | 101000110101… |
… | …0100101001011 |
3 | 1111021122100200 |
4 | 1101222211023 |
5 | 20440024300 |
6 | 2042503243 |
7 | 346652133 |
oct | 121524513 |
9 | 44248320 |
10 | 21408075 |
11 | 110a2227 |
12 | 7204b23 |
13 | 4587300 |
14 | 2bb3ac3 |
15 | 1d2d200 |
hex | 146a94b |
21408075 has 54 divisors (see below), whose sum is σ = 41594436. Its totient is φ = 10520640.
The previous prime is 21408071. The next prime is 21408097. The reversal of 21408075 is 57080412.
It is not a de Polignac number, because 21408075 - 22 = 21408071 is a prime.
It is not an unprimeable number, because it can be changed into a prime (21408071) by changing a digit.
It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 37744 + ... + 38306.
Almost surely, 221408075 is an apocalyptic number.
21408075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.
21408075 is a deficient number, since it is larger than the sum of its proper divisors (20186361).
21408075 is a wasteful number, since it uses less digits than its factorization.
21408075 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 605 (or 584 counting only the distinct ones).
The product of its (nonzero) digits is 2240, while the sum is 27.
The square root of 21408075 is about 4626.8861019048. The cubic root of 21408075 is about 277.6680258271.
Adding to 21408075 its reverse (57080412), we get a palindrome (78488487).
The spelling of 21408075 in words is "twenty-one million, four hundred eight thousand, seventy-five".
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