Base | Representation |
---|---|
bin | 101000000011… |
… | …1100110000001 |
3 | 1110112001012000 |
4 | 1100013212001 |
5 | 20334041000 |
6 | 2030054213 |
7 | 343343100 |
oct | 120074601 |
9 | 43461160 |
10 | 21002625 |
11 | 10945646 |
12 | 704a369 |
13 | 44748b7 |
14 | 2b0a037 |
15 | 1c9d000 |
hex | 1407981 |
21002625 has 96 divisors (see below), whose sum is σ = 45527040. Its totient is φ = 9525600.
The previous prime is 21002623. The next prime is 21002629. The reversal of 21002625 is 52620012.
It is not a de Polignac number, because 21002625 - 21 = 21002623 is a prime.
It is a super-2 number, since 2×210026252 = 882220513781250, which contains 22 as substring.
It is a junction number, because it is equal to n+sod(n) for n = 21002598 and 21002607.
It is not an unprimeable number, because it can be changed into a prime (21002621) by changing a digit.
It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 165312 + ... + 165438.
It is an arithmetic number, because the mean of its divisors is an integer number (474240).
Almost surely, 221002625 is an apocalyptic number.
21002625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.
21002625 is the 2450-th nonagonal number.
It is an amenable number.
21002625 is an abundant number, since it is smaller than the sum of its proper divisors (24524415).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21002625 is a wasteful number, since it uses less digits than its factorization.
21002625 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 165 (or 142 counting only the distinct ones).
The product of its (nonzero) digits is 240, while the sum is 18.
The square root of 21002625 is about 4582.8620969870. The cubic root of 21002625 is about 275.9039126766.
Adding to 21002625 its reverse (52620012), we get a palindrome (73622637).
The spelling of 21002625 in words is "twenty-one million, two thousand, six hundred twenty-five".
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