Base | Representation |
---|---|
bin | 10011101001101010… |
… | …000111001111010100 |
3 | 2000110111101001212100 |
4 | 103221222013033110 |
5 | 321203100001322 |
6 | 13405422122100 |
7 | 1344610020414 |
oct | 235152071724 |
9 | 60414331770 |
10 | 21100000212 |
11 | 8a48444505 |
12 | 410a420330 |
13 | 1cb3558735 |
14 | 1042424644 |
15 | 837601dac |
hex | 4e9a873d4 |
21100000212 has 36 divisors (see below), whose sum is σ = 54777631636. Its totient is φ = 6843242880.
The previous prime is 21100000157. The next prime is 21100000219. The reversal of 21100000212 is 21200000112.
It can be written as a sum of positive squares in 2 ways, for example, as 20493067716 + 606932496 = 143154^2 + 24636^2 .
It is a tau number, because it is divible by the number of its divisors (36).
It is a Harshad number since it is a multiple of its sum of digits (9).
It is a junction number, because it is equal to n+sod(n) for n = 21100000194 and 21100000203.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (21100000219) by changing a digit.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7919089 + ... + 7921752.
Almost surely, 221100000212 is an apocalyptic number.
It is an amenable number.
21100000212 is an abundant number, since it is smaller than the sum of its proper divisors (33677631424).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21100000212 is a wasteful number, since it uses less digits than its factorization.
21100000212 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 15840888 (or 15840883 counting only the distinct ones).
The product of its (nonzero) digits is 8, while the sum is 9.
Adding to 21100000212 its reverse (21200000112), we get a palindrome (42300000324).
The spelling of 21100000212 in words is "twenty-one billion, one hundred million, two hundred twelve", and thus it is an aban number.
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