| Base | Representation |
|---|---|
| bin | 10100001011111111… |
| … | …011101000100101100 |
| 3 | 2001221122020220111000 |
| 4 | 110023333131010230 |
| 5 | 323343030120022 |
| 6 | 13542520200300 |
| 7 | 1365103062423 |
| oct | 241377350454 |
| 9 | 61848226430 |
| 10 | 21676020012 |
| 11 | 9213603729 |
| 12 | 424b309090 |
| 13 | 20759a935a |
| 14 | 1098b282ba |
| 15 | 86ce846ac |
| hex | 50bfdd12c |
21676020012 has 108 divisors (see below), whose sum is σ = 58195718280. Its totient is φ = 6976964160.
The previous prime is 21676020011. The next prime is 21676020031. The reversal of 21676020012 is 21002067612.
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 is a tau number, because it is divible by the number of its divisors (108).
It is a Harshad number since it is a multiple of its sum of digits (27).
It is not an unprimeable number, because it can be changed into a prime (21676020011) by changing a digit.
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 35 ways as a sum of consecutive naturals, for example, 47430888 + ... + 47431344.
Almost surely, 221676020012 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 21676020012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29097859140).
21676020012 is an abundant number, since it is smaller than the sum of its proper divisors (36519698268).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21676020012 is an equidigital number, since it uses as much as digits as its factorization.
21676020012 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 989 (or 493 counting only the distinct ones).
The product of its (nonzero) digits is 2016, while the sum is 27.
Multiplying 21676020012 by its sum of digits (27), we get a square (585252540324 = 7650182).
21676020012 divided by its sum of digits (27) gives a square (802815556 = 283342).
Adding to 21676020012 its reverse (21002067612), we get a palindrome (42678087624).
The spelling of 21676020012 in words is "twenty-one billion, six hundred seventy-six million, twenty thousand, twelve".
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