Base | Representation |
---|---|
bin | 10100000010001110… |
… | …111101001000000111 |
3 | 2001112020012122100111 |
4 | 110002032331020013 |
5 | 323024122430203 |
6 | 13514351253451 |
7 | 1361044425520 |
oct | 240216751007 |
9 | 61466178314 |
10 | 21512311303 |
11 | 913a15897a |
12 | 420451a287 |
13 | 204aaba7b2 |
14 | 10810b1847 |
15 | 85d8e826d |
hex | 5023bd207 |
21512311303 has 12 divisors (see below), whose sum is σ = 25267941552. Its totient is φ = 17940761280.
The previous prime is 21512311237. The next prime is 21512311319. The reversal of 21512311303 is 30311321512.
It is not a de Polignac number, because 21512311303 - 217 = 21512180231 is a prime.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (21512311363) by changing a digit.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1112838 + ... + 1132003.
It is an arithmetic number, because the mean of its divisors is an integer number (2105661796).
Almost surely, 221512311303 is an apocalyptic number.
21512311303 is a deficient number, since it is larger than the sum of its proper divisors (3755630249).
21512311303 is an equidigital number, since it uses as much as digits as its factorization.
21512311303 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 2244922 (or 2244885 counting only the distinct ones).
The product of its (nonzero) digits is 540, while the sum is 22.
Adding to 21512311303 its reverse (30311321512), we get a palindrome (51823632815).
The spelling of 21512311303 in words is "twenty-one billion, five hundred twelve million, three hundred eleven thousand, three hundred three".
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