Base | Representation |
---|---|
bin | 1001110010000110001101… |
… | …10101000010100011001111 |
3 | 2211011120121100021202220211 |
4 | 10321003012311002203033 |
5 | 10304430131143324330 |
6 | 113430415404223251 |
7 | 4350141412004200 |
oct | 471030665024317 |
9 | 84146540252824 |
10 | 21512532011215 |
11 | 6944460542993 |
12 | 24b533353ab27 |
13 | c00813b4449b |
14 | 5452d80315a7 |
15 | 2748cc53dd2a |
hex | 1390c6d428cf |
21512532011215 has 24 divisors (see below), whose sum is σ = 30053254848192. Its totient is φ = 14739898662720.
The previous prime is 21512532011161. The next prime is 21512532011221. The reversal of 21512532011215 is 51211023521512.
It is not a de Polignac number, because 21512532011215 - 29 = 21512532010703 is a prime.
It is a Duffinian number.
It is a congruent number.
It is an unprimeable number.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34067031 + ... + 34692760.
It is an arithmetic number, because the mean of its divisors is an integer number (1252218952008).
Almost surely, 221512532011215 is an apocalyptic number.
21512532011215 is a deficient number, since it is larger than the sum of its proper divisors (8540722836977).
21512532011215 is a wasteful number, since it uses less digits than its factorization.
21512532011215 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 68761087 (or 68761080 counting only the distinct ones).
The product of its (nonzero) digits is 6000, while the sum is 31.
Adding to 21512532011215 its reverse (51211023521512), we get a palindrome (72723555532727).
The spelling of 21512532011215 in words is "twenty-one trillion, five hundred twelve billion, five hundred thirty-two million, eleven thousand, two hundred fifteen".
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