Base | Representation |
---|---|
bin | 10011101010011000… |
… | …101100101000101011 |
3 | 2000111100100111022012 |
4 | 103222120230220223 |
5 | 321214211241021 |
6 | 13410535550135 |
7 | 1345115561342 |
oct | 235230545053 |
9 | 60440314265 |
10 | 21112212011 |
11 | 8a54325400 |
12 | 411252b34b |
13 | 1cb5c42c57 |
14 | 1043cc2b59 |
15 | 83871535b |
hex | 4ea62ca2b |
21112212011 has 6 divisors (see below), whose sum is σ = 23205985236. Its totient is φ = 19192919900.
The previous prime is 21112211993. The next prime is 21112212067. The reversal of 21112212011 is 11021221112.
It is a de Polignac number, because none of the positive numbers 2k-21112212011 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (21112212811) 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 in 5 ways as a sum of consecutive naturals, for example, 87240425 + ... + 87240666.
It is an arithmetic number, because the mean of its divisors is an integer number (3867664206).
Almost surely, 221112212011 is an apocalyptic number.
21112212011 is a deficient number, since it is larger than the sum of its proper divisors (2093773225).
21112212011 is a wasteful number, since it uses less digits than its factorization.
21112212011 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 174481113 (or 174481102 counting only the distinct ones).
The product of its (nonzero) digits is 16, while the sum is 14.
Adding to 21112212011 its reverse (11021221112), we get a palindrome (32133433123).
It can be divided in two parts, 2111 and 2212011, that added together give a palindrome (2214122).
The spelling of 21112212011 in words is "twenty-one billion, one hundred twelve million, two hundred twelve thousand, eleven".
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