Base | Representation |
---|---|
bin | 10011101111101000… |
… | …011000110100010100 |
3 | 2000201110221022112011 |
4 | 103233220120310110 |
5 | 321404223224340 |
6 | 13423402034004 |
7 | 1350234551656 |
oct | 235750306424 |
9 | 60643838464 |
10 | 21200211220 |
11 | 8a99a6a521 |
12 | 4137aa8904 |
13 | 1ccb2442a6 |
14 | 105186c6d6 |
15 | 8412e90ea |
hex | 4efa18d14 |
21200211220 has 12 divisors (see below), whose sum is σ = 44520443604. Its totient is φ = 8480084480.
The previous prime is 21200211203. The next prime is 21200211239. The reversal of 21200211220 is 2211200212.
It is a happy number.
It can be written as a sum of positive squares in 2 ways, for example, as 3135776004 + 18064435216 = 55998^2 + 134404^2 .
It is a super-2 number, since 2×212002112202 (a number of 21 digits) contains 22 as substring.
It is a self number, because there is not a number n which added to its sum of digits gives 21200211220.
It is a congruent number.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 530005261 + ... + 530005300.
It is an arithmetic number, because the mean of its divisors is an integer number (3710036967).
Almost surely, 221200211220 is an apocalyptic number.
21200211220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.
It is an amenable number.
21200211220 is an abundant number, since it is smaller than the sum of its proper divisors (23320232384).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21200211220 is a wasteful number, since it uses less digits than its factorization.
21200211220 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1060010570 (or 1060010568 counting only the distinct ones).
The product of its (nonzero) digits is 32, while the sum is 13.
Adding to 21200211220 its reverse (2211200212), we get a palindrome (23411411432).
The spelling of 21200211220 in words is "twenty-one billion, two hundred million, two hundred eleven thousand, two hundred twenty".
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