Base | Representation |
---|---|
bin | 101001110001… |
… | …1111110100100 |
3 | 1112012220110000 |
4 | 1103203332210 |
5 | 21101432231 |
6 | 2101301300 |
7 | 354122616 |
oct | 123437644 |
9 | 45186400 |
10 | 21905316 |
11 | 11401874 |
12 | 7404830 |
13 | 46cc734 |
14 | 2ca2db6 |
15 | 1dca6e6 |
hex | 14e3fa4 |
21905316 has 120 divisors (see below), whose sum is σ = 62752536. Its totient is φ = 6635520.
The previous prime is 21905297. The next prime is 21905321. The reversal of 21905316 is 61350912.
21905316 = 1933 + 1943 + 1953.
It can be written as a sum of positive squares in 4 ways, for example, as 1166400 + 20738916 = 1080^2 + 4554^2 .
It is a super-3 number, since 3×219053163 (a number of 23 digits) contains 333 as substring.
It is a Harshad number since it is a multiple of its sum of digits (27).
It is a self number, because there is not a number n which added to its sum of digits gives 21905316.
It is a congruent number.
It is an unprimeable number.
It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 225780 + ... + 225876.
Almost surely, 221905316 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 21905316, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31376268).
21905316 is an abundant number, since it is smaller than the sum of its proper divisors (40847220).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21905316 is a wasteful number, since it uses less digits than its factorization.
21905316 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 171 (or 160 counting only the distinct ones).
The product of its (nonzero) digits is 1620, while the sum is 27.
The square root of 21905316 is about 4680.3115280930. The cubic root of 21905316 is about 279.8013727359.
The spelling of 21905316 in words is "twenty-one million, nine hundred five thousand, three hundred sixteen".
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