Base | Representation |
---|---|
bin | 10011100100011010… |
… | …011011010011011100 |
3 | 2000020100210022000202 |
4 | 103210122123103130 |
5 | 321013033031022 |
6 | 13353000043032 |
7 | 1342461033041 |
oct | 234432332334 |
9 | 60210708022 |
10 | 21012002012 |
11 | 8a02800121 |
12 | 40a4a63478 |
13 | 1c9b2579b1 |
14 | 10348791c8 |
15 | 82ea1d592 |
hex | 4e469b4dc |
21012002012 has 12 divisors (see below), whose sum is σ = 37274716416. Its totient is φ = 10362083040.
The previous prime is 21012002009. The next prime is 21012002021. The reversal of 21012002012 is 21020021012.
It is a happy number.
It is a junction number, because it is equal to n+sod(n) for n = 21012001984 and 21012002002.
It is a congruent number.
It is an unprimeable number.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35979164 + ... + 35979747.
It is an arithmetic number, because the mean of its divisors is an integer number (3106226368).
Almost surely, 221012002012 is an apocalyptic number.
It is an amenable number.
21012002012 is a deficient number, since it is larger than the sum of its proper divisors (16262714404).
21012002012 is a wasteful number, since it uses less digits than its factorization.
21012002012 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 71958988 (or 71958986 counting only the distinct ones).
The product of its (nonzero) digits is 16, while the sum is 11.
Adding to 21012002012 its reverse (21020021012), we get a palindrome (42032023024).
The spelling of 21012002012 in words is "twenty-one billion, twelve million, two thousand, twelve".
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