Base | Representation |
---|---|
bin | 101000100000… |
… | …0011011100000 |
3 | 1110221212112012 |
4 | 1101000123200 |
5 | 20414013144 |
6 | 2035052052 |
7 | 345332600 |
oct | 121003340 |
9 | 43855465 |
10 | 21235424 |
11 | 10a94541 |
12 | 7141028 |
13 | 4526852 |
14 | 2b6ac00 |
15 | 1ce6e9e |
hex | 14406e0 |
21235424 has 72 divisors (see below), whose sum is σ = 50417640. Its totient is φ = 8768256.
The previous prime is 21235367. The next prime is 21235427. The reversal of 21235424 is 42453212.
It is a happy number.
It is a self number, because there is not a number n which added to its sum of digits gives 21235424.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (21235427) by changing a digit.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45239 + ... + 45705.
It is an arithmetic number, because the mean of its divisors is an integer number (700245).
Almost surely, 221235424 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 21235424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25208820).
21235424 is an abundant number, since it is smaller than the sum of its proper divisors (29182216).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21235424 is a wasteful number, since it uses less digits than its factorization.
21235424 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 520 (or 505 counting only the distinct ones).
The product of its digits is 1920, while the sum is 23.
The square root of 21235424 is about 4608.1909682651. The cubic root of 21235424 is about 276.9195681100.
Adding to 21235424 its reverse (42453212), we get a palindrome (63688636).
The spelling of 21235424 in words is "twenty-one million, two hundred thirty-five thousand, four hundred twenty-four".
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