Base | Representation |
---|---|
bin | 101000011100… |
… | …0001011110000 |
3 | 1110220011012020 |
4 | 1100320023300 |
5 | 20411423043 |
6 | 2034231440 |
7 | 345132246 |
oct | 120701360 |
9 | 43804166 |
10 | 21201648 |
11 | 10a71126 |
12 | 7125580 |
13 | 4514370 |
14 | 2b5c796 |
15 | 1cdbe83 |
hex | 14382f0 |
21201648 has 80 divisors (see below), whose sum is σ = 60058656. Its totient is φ = 6405120.
The previous prime is 21201647. The next prime is 21201673. The reversal of 21201648 is 84610212.
It is a Harshad number since it is a multiple of its sum of digits (24).
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (21201641) by changing a digit.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37786 + ... + 38342.
Almost surely, 221201648 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 21201648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30029328).
21201648 is an abundant number, since it is smaller than the sum of its proper divisors (38857008).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21201648 is a wasteful number, since it uses less digits than its factorization.
21201648 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 642 (or 636 counting only the distinct ones).
The product of its (nonzero) digits is 768, while the sum is 24.
The square root of 21201648 is about 4604.5247311748. The cubic root of 21201648 is about 276.7726720768.
The spelling of 21201648 in words is "twenty-one million, two hundred one thousand, six hundred forty-eight".
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