Base | Representation |
---|---|
bin | 10011100100111001… |
… | …011001010010010100 |
3 | 2000020221001202002211 |
4 | 103210321121102110 |
5 | 321022122321322 |
6 | 13353450043204 |
7 | 1342620034210 |
oct | 234471312224 |
9 | 60227052084 |
10 | 21020120212 |
11 | 8a07345483 |
12 | 40a7719504 |
13 | 1c9cb3ab70 |
14 | 103598d940 |
15 | 8305c3b77 |
hex | 4e4e59494 |
21020120212 has 48 divisors (see below), whose sum is σ = 45562599040. Its totient is φ = 8262663552.
The previous prime is 21020120167. The next prime is 21020120213. The reversal of 21020120212 is 21202102012.
It is a happy number.
It is a Harshad number since it is a multiple of its sum of digits (13).
It is a junction number, because it is equal to n+sod(n) for n = 21020120192 and 21020120201.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (21020120213) by changing a digit.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126762 + ... + 241057.
Almost surely, 221020120212 is an apocalyptic number.
It is an amenable number.
21020120212 is an abundant number, since it is smaller than the sum of its proper divisors (24542478828).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21020120212 is a wasteful number, since it uses less digits than its factorization.
21020120212 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 368000 (or 367998 counting only the distinct ones).
The product of its (nonzero) digits is 32, while the sum is 13.
Adding to 21020120212 its reverse (21202102012), we get a palindrome (42222222224).
The spelling of 21020120212 in words is "twenty-one billion, twenty million, one hundred twenty thousand, two hundred twelve".
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