Base | Representation |
---|---|
bin | 1001110101100000010110… |
… | …01010111111000001010101 |
3 | 2211120202212222202202220100 |
4 | 10322300023022333001111 |
5 | 10313340002014402410 |
6 | 114000304245324313 |
7 | 4361455465465656 |
oct | 472601312770125 |
9 | 84522788682810 |
10 | 21629642731605 |
11 | 698a097490517 |
12 | 2513b77706699 |
13 | c0b88857253c |
14 | 54ac4775352d |
15 | 277983a218c0 |
hex | 13ac0b2bf055 |
21629642731605 has 96 divisors (see below), whose sum is σ = 38350900897920. Its totient is φ = 11273794191360.
The previous prime is 21629642731603. The next prime is 21629642731633. The reversal of 21629642731605 is 50613724692612.
It is a happy number.
21629642731605 is a `hidden beast` number, since 2 + 1 + 6 + 2 + 9 + 6 + 4 + 27 + 3 + 1 + 605 = 666.
It is not a de Polignac number, because 21629642731605 - 21 = 21629642731603 is a prime.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (21629642731603) by changing a digit.
It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 396504942 + ... + 396559488.
It is an arithmetic number, because the mean of its divisors is an integer number (399488551020).
Almost surely, 221629642731605 is an apocalyptic number.
It is an amenable number.
21629642731605 is a deficient number, since it is larger than the sum of its proper divisors (16721258166315).
21629642731605 is a wasteful number, since it uses less digits than its factorization.
21629642731605 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 55491 (or 55488 counting only the distinct ones).
The product of its (nonzero) digits is 6531840, while the sum is 54.
The spelling of 21629642731605 in words is "twenty-one trillion, six hundred twenty-nine billion, six hundred forty-two million, seven hundred thirty-one thousand, six hundred five".
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