| Base | Representation |
|---|---|
| bin | 11010011001111… |
| … | …01001001100000 |
| 3 | 120102210100212201 |
| 4 | 31030331021200 |
| 5 | 423201000000 |
| 6 | 33551302544 |
| 7 | 5326501411 |
| oct | 1514751140 |
| 9 | 512710781 |
| 10 | 221500000 |
| 11 | 104038257 |
| 12 | 6221aa54 |
| 13 | 36b743b7 |
| 14 | 215bb808 |
| 15 | 146a496a |
| hex | d33d260 |
221500000 has 84 divisors (see below), whose sum is σ = 546321132. Its totient is φ = 88400000.
The previous prime is 221499989. The next prime is 221500039. The reversal of 221500000 is 5122.
221500000 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.
It is a Harshad number since it is a multiple of its sum of digits (10).
It is a self number, because there is not a number n which added to its sum of digits gives 221500000.
It is a congruent number.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 499779 + ... + 500221.
It is an arithmetic number, because the mean of its divisors is an integer number (6503823).
Almost surely, 2221500000 is an apocalyptic number.
221500000 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 221500000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (273160566).
221500000 is an abundant number, since it is smaller than the sum of its proper divisors (324821132).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
221500000 is an frugal number, since it uses more digits than its factorization.
221500000 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 483 (or 450 counting only the distinct ones).
The product of its (nonzero) digits is 20, while the sum is 10.
The square root of 221500000 is about 14882.8760661372. The cubic root of 221500000 is about 605.0499696905.
Adding to 221500000 its reverse (5122), we get a palindrome (221505122).
The spelling of 221500000 in words is "two hundred twenty-one million, five hundred thousand".
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