Base | Representation |
---|---|
bin | 101000001100… |
… | …0000101111110 |
3 | 1110122110220000 |
4 | 1100120011332 |
5 | 20343221311 |
6 | 2031335130 |
7 | 344044113 |
oct | 120300576 |
9 | 43573800 |
10 | 21070206 |
11 | 109913a3 |
12 | 70814a6 |
13 | 44995a1 |
14 | 2b2690a |
15 | 1cb3056 |
hex | 141817e |
21070206 has 40 divisors (see below), whose sum is σ = 47672064. Its totient is φ = 6955200.
The previous prime is 21070201. The next prime is 21070237. The reversal of 21070206 is 60207012.
It is a happy number.
It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.
It is a Harshad number since it is a multiple of its sum of digits (18).
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (21070201) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 17731 + ... + 18881.
Almost surely, 221070206 is an apocalyptic number.
It is a practical number, because each smaller number is the sum of distinct divisors of 21070206, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23836032).
21070206 is an abundant number, since it is smaller than the sum of its proper divisors (26601858).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21070206 is a wasteful number, since it uses less digits than its factorization.
21070206 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1278 (or 1269 counting only the distinct ones).
The product of its (nonzero) digits is 168, while the sum is 18.
The square root of 21070206 is about 4590.2294060319. The cubic root of 21070206 is about 276.1995249126.
Adding to 21070206 its reverse (60207012), we get a palindrome (81277218).
It can be divided in two parts, 2 and 1070206, that multiplied together give a palindrome (2140412).
The spelling of 21070206 in words is "twenty-one million, seventy thousand, two hundred six".
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