Base | Representation |
---|---|
bin | 10100101100100011… |
… | …00100000001111101 |
3 | 1001200100112102121210 |
4 | 22112101210001331 |
5 | 140223421333041 |
6 | 5034313515033 |
7 | 542225653560 |
oct | 122621440175 |
9 | 31610472553 |
10 | 11111121021 |
11 | 4791a35750 |
12 | 21a1112a79 |
13 | 1080c63030 |
14 | 7759584d7 |
15 | 4506de016 |
hex | 29646407d |
11111121021 has 64 divisors (see below), whose sum is σ = 19992268800. Its totient is φ = 5300951040.
The previous prime is 11111121019. The next prime is 11111121031. The reversal of 11111121021 is 12012111111.
It is not a de Polignac number, because 11111121021 - 21 = 11111121019 is a prime.
It is a Curzon number.
It is a junction number, because it is equal to n+sod(n) for n = 11111120988 and 11111121006.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (11111121031) by changing a digit.
It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 588301 + ... + 606893.
It is an arithmetic number, because the mean of its divisors is an integer number (312379200).
Almost surely, 211111121021 is an apocalyptic number.
11111121021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.
It is an amenable number.
11111121021 is a deficient number, since it is larger than the sum of its proper divisors (8881147779).
11111121021 is a wasteful number, since it uses less digits than its factorization.
11111121021 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 18826.
The product of its (nonzero) digits is 4, while the sum is 12.
Adding to 11111121021 its reverse (12012111111), we get a palindrome (23123232132).
The spelling of 11111121021 in words is "eleven billion, one hundred eleven million, one hundred twenty-one thousand, twenty-one".
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