Base | Representation |
---|---|
bin | 100100011001000… |
… | …1000011000110111 |
3 | 10011002201100211002 |
4 | 1020302020120313 |
5 | 10000100213421 |
6 | 321100233515 |
7 | 42155121356 |
oct | 11062103067 |
9 | 3132640732 |
10 | 1221101111 |
11 | 57730937a |
12 | 2a0b3b89b |
13 | 165ca1b49 |
14 | b826399d |
15 | 72307b0b |
hex | 48c88637 |
1221101111 has 8 divisors (see below), whose sum is σ = 1262158800. Its totient is φ = 1180722240.
The previous prime is 1221101107. The next prime is 1221101113. The reversal of 1221101111 is 1111011221.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is not a de Polignac number, because 1221101111 - 22 = 1221101107 is a prime.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 1221101092 and 1221101101.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1221101113) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166046 + ... + 173243.
It is an arithmetic number, because the mean of its divisors is an integer number (157769850).
Almost surely, 21221101111 is an apocalyptic number.
1221101111 is a deficient number, since it is larger than the sum of its proper divisors (41057689).
1221101111 is an equidigital number, since it uses as much as digits as its factorization.
1221101111 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 339409.
The product of its (nonzero) digits is 4, while the sum is 11.
The square root of 1221101111 is about 34944.2571962833. The cubic root of 1221101111 is about 1068.8511006533.
Adding to 1221101111 its reverse (1111011221), we get a palindrome (2332112332).
The spelling of 1221101111 in words is "one billion, two hundred twenty-one million, one hundred one thousand, one hundred eleven".
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