Base | Representation |
---|---|
bin | 10011101111101100… |
… | …100101101001001010 |
3 | 2000201120000020222000 |
4 | 103233230211221022 |
5 | 321410013443310 |
6 | 13423441411430 |
7 | 1350250116132 |
oct | 235754455112 |
9 | 60646006860 |
10 | 21201312330 |
11 | 8a9a651830 |
12 | 4138339b76 |
13 | 1ccb53b533 |
14 | 1051a77ac2 |
15 | 8414654c0 |
hex | 4efb25a4a |
21201312330 has 64 divisors (see below), whose sum is σ = 61676553600. Its totient is φ = 5139711360.
The previous prime is 21201312311. The next prime is 21201312361. The reversal of 21201312330 is 3321310212.
21201312330 is a `hidden beast` number, since 2 + 1 + 20 + 1 + 312 + 330 = 666.
It is a Harshad number since it is a multiple of its sum of digits (18).
It is a Curzon number.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (19) of ones.
It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3566275 + ... + 3572214.
It is an arithmetic number, because the mean of its divisors is an integer number (963696150).
Almost surely, 221201312330 is an apocalyptic number.
21201312330 is an abundant number, since it is smaller than the sum of its proper divisors (40475241270).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21201312330 is a wasteful number, since it uses less digits than its factorization.
21201312330 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 7138516 (or 7138510 counting only the distinct ones).
The product of its (nonzero) digits is 216, while the sum is 18.
Adding to 21201312330 its reverse (3321310212), we get a palindrome (24522622542).
The spelling of 21201312330 in words is "twenty-one billion, two hundred one million, three hundred twelve thousand, three hundred thirty".
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