Base | Representation |
---|---|
bin | 11010011100101… |
… | …11101100100101 |
3 | 120110111012122012 |
4 | 31032113230211 |
5 | 423244332020 |
6 | 34003244005 |
7 | 5332604615 |
oct | 1516275445 |
9 | 513435565 |
10 | 221870885 |
11 | 104270975 |
12 | 62379605 |
13 | 36c74162 |
14 | 21676a45 |
15 | 147297c5 |
hex | d397b25 |
221870885 has 16 divisors (see below), whose sum is σ = 287098560. Its totient is φ = 164050560.
The previous prime is 221870881. The next prime is 221870899. The reversal of 221870885 is 588078122.
It is not a de Polignac number, because 221870885 - 22 = 221870881 is a prime.
It is a super-2 number, since 2×2218708852 = 98453379221366450, which contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (41).
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (221870881) by changing a digit.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24587 + ... + 32376.
It is an arithmetic number, because the mean of its divisors is an integer number (17943660).
Almost surely, 2221870885 is an apocalyptic number.
It is an amenable number.
221870885 is a deficient number, since it is larger than the sum of its proper divisors (65227675).
221870885 is a wasteful number, since it uses less digits than its factorization.
221870885 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 57028.
The product of its (nonzero) digits is 71680, while the sum is 41.
The square root of 221870885 is about 14895.3309798742. The cubic root of 221870885 is about 605.3874848526.
The spelling of 221870885 in words is "two hundred twenty-one million, eight hundred seventy thousand, eight hundred eighty-five".
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