| Base | Representation |
|---|---|
| bin | 101000100000… |
| … | …1011010000000 |
| 3 | 1110222002000100 |
| 4 | 1101001122000 |
| 5 | 20414130144 |
| 6 | 2035122400 |
| 7 | 345350343 |
| oct | 121013200 |
| 9 | 43862010 |
| 10 | 21239424 |
| 11 | 10a97548 |
| 12 | 7143400 |
| 13 | 452860b |
| 14 | 2b6c45a |
| 15 | 1ce8269 |
| hex | 1441680 |
21239424 has 96 divisors (see below), whose sum is σ = 62056800. Its totient is φ = 6971904.
The previous prime is 21239381. The next prime is 21239429. The reversal of 21239424 is 42493212.
21239424 is a `hidden beast` number, since 2 + 1 + 239 + 424 = 666.
It is a tau number, because it is divible by the number of its divisors (96).
It is a super-2 number, since 2×212394242 = 902226263703552, which contains 22 as substring.
It is a nude number because it is divisible by every one of its digits.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (21239429) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 118567 + ... + 118745.
It is an arithmetic number, because the mean of its divisors is an integer number (646425).
Almost surely, 221239424 is an apocalyptic number.
21239424 is a gapful number since it is divisible by the number (24) 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 21239424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31028400).
21239424 is an abundant number, since it is smaller than the sum of its proper divisors (40817376).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21239424 is a wasteful number, since it uses less digits than its factorization.
21239424 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 302 (or 287 counting only the distinct ones).
The product of its digits is 3456, while the sum is 27.
The square root of 21239424 is about 4608.6249576202. The cubic root of 21239424 is about 276.9369542903.
The spelling of 21239424 in words is "twenty-one million, two hundred thirty-nine thousand, four hundred twenty-four".
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