Base | Representation |
---|---|
bin | 101000010101… |
… | …0100101111111 |
3 | 1110210022211120 |
4 | 1100222211333 |
5 | 20403132413 |
6 | 2033122023 |
7 | 344511045 |
oct | 120524577 |
9 | 43708746 |
10 | 21145983 |
11 | 10a33321 |
12 | 70b9313 |
13 | 44c4c21 |
14 | 2b46395 |
15 | 1cca723 |
hex | 142a97f |
21145983 has 8 divisors (see below), whose sum is σ = 28581168. Its totient is φ = 13904064.
The previous prime is 21145979. The next prime is 21145987. The reversal of 21145983 is 38954112.
It is an interprime number because it is at equal distance from previous prime (21145979) and next prime (21145987).
It is a sphenic number, since it is the product of 3 distinct primes.
It is not a de Polignac number, because 21145983 - 22 = 21145979 is a prime.
It is a zygodrome in base 4.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (21145987) 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, 48060 + ... + 48497.
It is an arithmetic number, because the mean of its divisors is an integer number (3572646).
Almost surely, 221145983 is an apocalyptic number.
21145983 is a deficient number, since it is larger than the sum of its proper divisors (7435185).
21145983 is an equidigital number, since it uses as much as digits as its factorization.
21145983 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 96633.
The product of its digits is 8640, while the sum is 33.
The square root of 21145983 is about 4598.4761606428. The cubic root of 21145983 is about 276.5302372464.
The spelling of 21145983 in words is "twenty-one million, one hundred forty-five thousand, nine hundred eighty-three".
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