Base | Representation |
---|---|
bin | 10010101111010100… |
… | …000010010110111001 |
3 | 1220221021110112120111 |
4 | 102233110002112321 |
5 | 312202002301041 |
6 | 13124333424321 |
7 | 1311422551525 |
oct | 225724022671 |
9 | 56837415514 |
10 | 20121134521 |
11 | 85959461a4 |
12 | 3a9663b0a1 |
13 | 1b8880b077 |
14 | d8c418d85 |
15 | 7cb6e7981 |
hex | 4af5025b9 |
20121134521 has 2 divisors, whose sum is σ = 20121134522. Its totient is φ = 20121134520.
The previous prime is 20121134503. The next prime is 20121134549. The reversal of 20121134521 is 12543112102.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 19497933225 + 623201296 = 139635^2 + 24964^2 .
It is a cyclic number.
It is not a de Polignac number, because 20121134521 - 27 = 20121134393 is a prime.
It is a junction number, because it is equal to n+sod(n) for n = 20121134492 and 20121134501.
It is not a weakly prime, because it can be changed into another prime (20121134221) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060567260 + 10060567261.
It is an arithmetic number, because the mean of its divisors is an integer number (10060567261).
Almost surely, 220121134521 is an apocalyptic number.
It is an amenable number.
20121134521 is a deficient number, since it is larger than the sum of its proper divisors (1).
20121134521 is an equidigital number, since it uses as much as digits as its factorization.
20121134521 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 480, while the sum is 22.
Adding to 20121134521 its reverse (12543112102), we get a palindrome (32664246623).
The spelling of 20121134521 in words is "twenty billion, one hundred twenty-one million, one hundred thirty-four thousand, five hundred twenty-one".
• e-mail: info -at- numbersaplenty.com • Privacy notice • done in 0.067 sec. • engine limits •