Base | Representation |
---|---|
bin | 11010010110000… |
… | …11001001110111 |
3 | 120101211222102201 |
4 | 31023003021313 |
5 | 423034002221 |
6 | 33532445331 |
7 | 5322320530 |
oct | 1513031167 |
9 | 511758381 |
10 | 221000311 |
11 | 103826894 |
12 | 62019847 |
13 | 36a2ab1c |
14 | 214cb687 |
15 | 14606891 |
hex | d2c3277 |
221000311 has 8 divisors (see below), whose sum is σ = 252661760. Its totient is φ = 189361368.
The previous prime is 221000281. The next prime is 221000327. The reversal of 221000311 is 113000122.
It is a sphenic number, since it is the product of 3 distinct primes.
It is not a de Polignac number, because 221000311 - 25 = 221000279 is a prime.
It is a super-2 number, since 2×2210003112 = 97682274924193442, which contains 22 as substring.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (221000911) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34930 + ... + 40768.
It is an arithmetic number, because the mean of its divisors is an integer number (31582720).
Almost surely, 2221000311 is an apocalyptic number.
221000311 is a deficient number, since it is larger than the sum of its proper divisors (31661449).
221000311 is an equidigital number, since it uses as much as digits as its factorization.
221000311 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 11253.
The product of its (nonzero) digits is 12, while the sum is 10.
The square root of 221000311 is about 14866.0792073768. The cubic root of 221000311 is about 604.5946432042.
Adding to 221000311 its reverse (113000122), we get a palindrome (334000433).
The spelling of 221000311 in words is "two hundred twenty-one million, three hundred eleven", and thus it is an aban number.
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