Base | Representation |
---|---|
bin | 101000001001… |
… | …1101101000000 |
3 | 1110121120020000 |
4 | 1100103231000 |
5 | 20342132344 |
6 | 2031120000 |
7 | 343640514 |
oct | 120235500 |
9 | 43546200 |
10 | 21052224 |
11 | 10979936 |
12 | 7073000 |
13 | 449134b |
14 | 2b20144 |
15 | 1caca69 |
hex | 1413b40 |
21052224 has 140 divisors (see below), whose sum is σ = 64910208. Its totient is φ = 6739200.
The previous prime is 21052219. The next prime is 21052243. The reversal of 21052224 is 42225012.
It is a super-2 number, since 2×210522242 = 886392270692352, which contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (18).
It is a junction number, because it is equal to n+sod(n) for n = 21052197 and 21052206.
It is a congruent number.
It is an unprimeable number.
It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 160639 + ... + 160769.
Almost surely, 221052224 is an apocalyptic number.
21052224 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 21052224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32455104).
21052224 is an abundant number, since it is smaller than the sum of its proper divisors (43857984).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21052224 is a wasteful number, since it uses less digits than its factorization.
21052224 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 186 (or 167 counting only the distinct ones).
The product of its (nonzero) digits is 320, while the sum is 18.
The square root of 21052224 is about 4588.2702623102. The cubic root of 21052224 is about 276.1209299933.
Adding to 21052224 its reverse (42225012), we get a palindrome (63277236).
The spelling of 21052224 in words is "twenty-one million, fifty-two thousand, two hundred twenty-four".
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