Base | Representation |
---|---|
bin | 101000111000… |
… | …0100001111100 |
3 | 1111022212210020 |
4 | 1101300201330 |
5 | 20441314234 |
6 | 2043212140 |
7 | 350113155 |
oct | 121604174 |
9 | 44285706 |
10 | 21432444 |
11 | 11109570 |
12 | 7217050 |
13 | 4595427 |
14 | 2bbc92c |
15 | 1d35549 |
hex | 147087c |
21432444 has 48 divisors (see below), whose sum is σ = 57770496. Its totient is φ = 6112000.
The previous prime is 21432443. The next prime is 21432473. The reversal of 21432444 is 44423412.
It is a happy number.
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 (21432443) 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 15 ways as a sum of consecutive naturals, for example, 2532 + ... + 7019.
It is an arithmetic number, because the mean of its divisors is an integer number (1203552).
Almost surely, 221432444 is an apocalyptic number.
It is an amenable number.
21432444 is an abundant number, since it is smaller than the sum of its proper divisors (36338052).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21432444 is a wasteful number, since it uses less digits than its factorization.
21432444 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 9586 (or 9584 counting only the distinct ones).
The product of its digits is 3072, while the sum is 24.
The square root of 21432444 is about 4629.5187654874. The cubic root of 21432444 is about 277.7733431944.
Adding to 21432444 its reverse (44423412), we get a palindrome (65855856).
The spelling of 21432444 in words is "twenty-one million, four hundred thirty-two thousand, four hundred forty-four".
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