Base | Representation |
---|---|
bin | 10100001110101000… |
… | …100011111101010110 |
3 | 2002001201200010112210 |
4 | 110032220203331112 |
5 | 323440402204200 |
6 | 13551142254250 |
7 | 1366151635113 |
oct | 241650437526 |
9 | 62051603483 |
10 | 21720350550 |
11 | 9236631938 |
12 | 4262127386 |
13 | 2081c2b042 |
14 | 10a098790a |
15 | 871cde650 |
hex | 50ea23f56 |
21720350550 has 48 divisors (see below), whose sum is σ = 54121839552. Its totient is φ = 5764634400.
The previous prime is 21720350521. The next prime is 21720350551. The reversal of 21720350550 is 5505302712.
It is a Harshad number since it is a multiple of its sum of digits (30).
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (21720350551) by changing a digit.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 311484 + ... + 374783.
It is an arithmetic number, because the mean of its divisors is an integer number (1127538324).
Almost surely, 221720350550 is an apocalyptic number.
21720350550 is an abundant number, since it is smaller than the sum of its proper divisors (32401489002).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21720350550 is a wasteful number, since it uses less digits than its factorization.
21720350550 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 686493 (or 686488 counting only the distinct ones).
The product of its (nonzero) digits is 10500, while the sum is 30.
The spelling of 21720350550 in words is "twenty-one billion, seven hundred twenty million, three hundred fifty thousand, five hundred fifty".
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