| Base | Representation |
|---|---|
| bin | 101000011100… |
| … | …0100010000000 |
| 3 | 1110220020010222 |
| 4 | 1100320202000 |
| 5 | 20411444242 |
| 6 | 2034242212 |
| 7 | 345136352 |
| oct | 120704200 |
| 9 | 43806128 |
| 10 | 21203072 |
| 11 | 10a72200 |
| 12 | 7126368 |
| 13 | 4514bc7 |
| 14 | 2b5d0d2 |
| 15 | 1cdc5d2 |
| hex | 1438880 |
21203072 has 72 divisors (see below), whose sum is σ = 47718405. Its totient is φ = 9377280.
The previous prime is 21203071. The next prime is 21203099. The reversal of 21203072 is 27030212.
It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.
It can be written as a sum of positive squares in 2 ways, for example, as 17106496 + 4096576 = 4136^2 + 2024^2 .
It is an ABA number since it can be written as A⋅BA, here for A=2, B=3256.
It is a Duffinian number.
It is a self number, because there is not a number n which added to its sum of digits gives 21203072.
It is not an unprimeable number, because it can be changed into a prime (21203071) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 573038 + ... + 573074.
Almost surely, 221203072 is an apocalyptic number.
21203072 is a gapful number since it is divisible by the number (22) 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 21203072
21203072 is an abundant number, since it is smaller than the sum of its proper divisors (26515333).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21203072 is an equidigital number, since it uses as much as digits as its factorization.
21203072 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 110 (or 50 counting only the distinct ones).
The product of its (nonzero) digits is 168, while the sum is 17.
The square root of 21203072 is about 4604.6793590868. The cubic root of 21203072 is about 276.7788683791.
Adding to 21203072 its reverse (27030212), we get a palindrome (48233284).
The spelling of 21203072 in words is "twenty-one million, two hundred three thousand, seventy-two".
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