| Base | Representation |
|---|---|
| bin | 101000100010… |
| … | …0000100010000 |
| 3 | 1110222121221220 |
| 4 | 1101010010100 |
| 5 | 20420002240 |
| 6 | 2035245040 |
| 7 | 345424200 |
| oct | 121040420 |
| 9 | 43877856 |
| 10 | 21250320 |
| 11 | 10aa4753 |
| 12 | 7149780 |
| 13 | 4530570 |
| 14 | 2b72400 |
| 15 | 1ceb5d0 |
| hex | 1444110 |
21250320 has 240 divisors, whose sum is σ = 83119680. Its totient is φ = 4451328.
The previous prime is 21250309. The next prime is 21250331. The reversal of 21250320 is 2305212.
It is an interprime number because it is at equal distance from previous prime (21250309) and next prime (21250331).
It is a tau number, because it is divible by the number of its divisors (240).
It is a super-2 number, since 2×212503202 = 903152200204800, which contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (15).
It is a self number, because there is not a number n which added to its sum of digits gives 21250320.
It is an unprimeable number.
It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 152811 + ... + 152949.
It is an arithmetic number, because the mean of its divisors is an integer number (346332).
Almost surely, 221250320 is an apocalyptic number.
21250320 is a gapful number since it is divisible by the number (20) 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 21250320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41559840).
21250320 is an abundant number, since it is smaller than the sum of its proper divisors (61869360).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21250320 is a wasteful number, since it uses less digits than its factorization.
21250320 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 182 (or 169 counting only the distinct ones).
The product of its (nonzero) digits is 120, while the sum is 15.
The square root of 21250320 is about 4609.8069373890. The cubic root of 21250320 is about 276.9843031763.
Adding to 21250320 its reverse (2305212), we get a palindrome (23555532).
The spelling of 21250320 in words is "twenty-one million, two hundred fifty thousand, three hundred twenty".
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