Base | Representation |
---|---|
bin | 10010101111010011… |
… | …100100011101111011 |
3 | 1220221021020022122001 |
4 | 102233103210131323 |
5 | 312201434341331 |
6 | 13124331041431 |
7 | 1311421531555 |
oct | 225723443573 |
9 | 56837208561 |
10 | 20121012091 |
11 | 8595872214 |
12 | 3a965a0277 |
13 | 1b8879741b |
14 | d8c3c64d5 |
15 | 7cb6c1561 |
hex | 4af4e477b |
20121012091 has 2 divisors, whose sum is σ = 20121012092. Its totient is φ = 20121012090.
The previous prime is 20121012089. The next prime is 20121012151. The reversal of 20121012091 is 19021012102.
It is a happy number.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 20121012091 - 21 = 20121012089 is a prime.
Together with 20121012089, it forms a pair of twin primes.
It is not a weakly prime, because it can be changed into another prime (20121012011) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060506045 + 10060506046.
It is an arithmetic number, because the mean of its divisors is an integer number (10060506046).
Almost surely, 220121012091 is an apocalyptic number.
20121012091 is a deficient number, since it is larger than the sum of its proper divisors (1).
20121012091 is an equidigital number, since it uses as much as digits as its factorization.
20121012091 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 72, while the sum is 19.
Adding to 20121012091 its reverse (19021012102), we get a palindrome (39142024193).
The spelling of 20121012091 in words is "twenty billion, one hundred twenty-one million, twelve thousand, ninety-one".
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