Base | Representation |
---|---|
bin | 10100010111100001… |
… | …000111110101010001 |
3 | 2002110010010101111000 |
4 | 110113201013311101 |
5 | 324242031122111 |
6 | 14014025012213 |
7 | 1402641535626 |
oct | 242741076521 |
9 | 62403111430 |
10 | 21869395281 |
11 | 93027813a8 |
12 | 42a4024069 |
13 | 20a6a841a6 |
14 | 10b66a434d |
15 | 87ee30c56 |
hex | 517847d51 |
21869395281 has 16 divisors (see below), whose sum is σ = 32632196800. Its totient is φ = 14474705184.
The previous prime is 21869395277. The next prime is 21869395283. The reversal of 21869395281 is 18259396812.
21869395281 is a `hidden beast` number, since 2 + 1 + 86 + 9 + 39 + 528 + 1 = 666.
It is not a de Polignac number, because 21869395281 - 22 = 21869395277 is a prime.
It is a super-2 number, since 2×218693952812 (a number of 21 digits) contains 22 as substring.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (21869395283) by changing a digit.
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 15 ways as a sum of consecutive naturals, for example, 2909836 + ... + 2917341.
It is an arithmetic number, because the mean of its divisors is an integer number (2039512300).
Almost surely, 221869395281 is an apocalyptic number.
It is an amenable number.
21869395281 is a deficient number, since it is larger than the sum of its proper divisors (10762801519).
21869395281 is a wasteful number, since it uses less digits than its factorization.
21869395281 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 5827325 (or 5827319 counting only the distinct ones).
The product of its digits is 1866240, while the sum is 54.
The spelling of 21869395281 in words is "twenty-one billion, eight hundred sixty-nine million, three hundred ninety-five thousand, two hundred eighty-one".
• e-mail: info -at- numbersaplenty.com • Privacy notice • done in 0.070 sec. • engine limits •