Base | Representation |
---|---|
bin | 11010010110010… |
… | …00011100101001 |
3 | 120101220002011202 |
4 | 31023020130221 |
5 | 423040200433 |
6 | 33533133545 |
7 | 5322440663 |
oct | 1513103451 |
9 | 511802152 |
10 | 221021993 |
11 | 103841105 |
12 | 6202a2b5 |
13 | 36a3795a |
14 | 214d5533 |
15 | 1460cee8 |
hex | d2c8729 |
221021993 has 2 divisors, whose sum is σ = 221021994. Its totient is φ = 221021992.
The previous prime is 221021987. The next prime is 221022007. The reversal of 221021993 is 399120122.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 139877929 + 81144064 = 11827^2 + 9008^2 .
It is a cyclic number.
It is not a de Polignac number, because 221021993 - 26 = 221021929 is a prime.
It is not a weakly prime, because it can be changed into another prime (221021893) 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 as a sum of consecutive naturals, namely, 110510996 + 110510997.
It is an arithmetic number, because the mean of its divisors is an integer number (110510997).
Almost surely, 2221021993 is an apocalyptic number.
It is an amenable number.
221021993 is a deficient number, since it is larger than the sum of its proper divisors (1).
221021993 is an equidigital number, since it uses as much as digits as its factorization.
221021993 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 1944, while the sum is 29.
The square root of 221021993 is about 14866.8084335543. The cubic root of 221021993 is about 604.6144145073.
The spelling of 221021993 in words is "two hundred twenty-one million, twenty-one thousand, nine hundred ninety-three".
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