Base | Representation |
---|---|
bin | 101000011111… |
… | …1010110100100 |
3 | 1110221122110210 |
4 | 1100333112210 |
5 | 20413343022 |
6 | 2035015420 |
7 | 345313665 |
oct | 120772644 |
9 | 43848423 |
10 | 21231012 |
11 | 10a911a0 |
12 | 713a570 |
13 | 452483a |
14 | 2b6936c |
15 | 1ce5a0c |
hex | 143f5a4 |
21231012 has 24 divisors (see below), whose sum is σ = 54042912. Its totient is φ = 6433600.
The previous prime is 21230969. The next prime is 21231029. The reversal of 21231012 is 21013212.
It is a Harshad number since it is a multiple of its sum of digits (12).
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80289 + ... + 80552.
It is an arithmetic number, because the mean of its divisors is an integer number (2251788).
Almost surely, 221231012 is an apocalyptic number.
21231012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.
It is an amenable number.
21231012 is an abundant number, since it is smaller than the sum of its proper divisors (32811900).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21231012 is a wasteful number, since it uses less digits than its factorization.
21231012 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 160859 (or 160857 counting only the distinct ones).
The product of its (nonzero) digits is 24, while the sum is 12.
The square root of 21231012 is about 4607.7122305977. The cubic root of 21231012 is about 276.9003886208.
Adding to 21231012 its reverse (21013212), we get a palindrome (42244224).
The spelling of 21231012 in words is "twenty-one million, two hundred thirty-one thousand, twelve".
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