Base | Representation |
---|---|
bin | 10100010001100101… |
… | …101000101011110010 |
3 | 2002012011221021100200 |
4 | 110101211220223302 |
5 | 324041044240442 |
6 | 14000112500030 |
7 | 1400323140204 |
oct | 242145505362 |
9 | 62164837320 |
10 | 21769915122 |
11 | 926160549a |
12 | 427684a616 |
13 | 208c2931a7 |
14 | 10a73aa774 |
15 | 87633034c |
hex | 511968af2 |
21769915122 has 54 divisors (see below), whose sum is σ = 47857505007. Its totient is φ = 7152098712.
The previous prime is 21769915121. The next prime is 21769915151. The reversal of 21769915122 is 22151996712.
It can be written as a sum of positive squares in only one way, i.e., 10884957561 + 10884957561 = 104331^2 + 104331^2 .
It is an ABA number since it can be written as A⋅BA, here for A=2, B=104331.
It is not an unprimeable number, because it can be changed into a prime (21769915121) by changing a digit.
It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 51956629 + ... + 51957047.
Almost surely, 221769915122 is an apocalyptic number.
21769915122 is an abundant number, since it is smaller than the sum of its proper divisors (26087589885).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21769915122 is an frugal number, since it uses more digits than its factorization.
21769915122 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1012 (or 507 counting only the distinct ones).
The product of its digits is 136080, while the sum is 45.
The spelling of 21769915122 in words is "twenty-one billion, seven hundred sixty-nine million, nine hundred fifteen thousand, one hundred twenty-two".
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