| Base | Representation |
|---|---|
| bin | 101000001100… |
| … | …1001110110100 |
| 3 | 1110122201021200 |
| 4 | 1100121032310 |
| 5 | 20343343433 |
| 6 | 2031412500 |
| 7 | 344063523 |
| oct | 120311664 |
| 9 | 43581250 |
| 10 | 21074868 |
| 11 | 10994951 |
| 12 | 7084130 |
| 13 | 449b749 |
| 14 | 2b284ba |
| 15 | 1cb4613 |
| hex | 14193b4 |
21074868 has 18 divisors (see below), whose sum is σ = 53272674. Its totient is φ = 7024944.
The previous prime is 21074843. The next prime is 21074897. The reversal of 21074868 is 86847012.
It can be written as a sum of positive squares in only one way, i.e., 17791524 + 3283344 = 4218^2 + 1812^2 .
It is a tau number, because it is divible by the number of its divisors (18).
It is a super-2 number, since 2×210748682 = 888300122434848, which contains 22 as substring.
It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.
It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 585413 = 21074868 / (2 + 1 + 0 + 7 + 4 + 8 + 6 + 8).
It is a congruent number.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 292671 + ... + 292742.
It is an arithmetic number, because the mean of its divisors is an integer number (2959593).
Almost surely, 221074868 is an apocalyptic number.
It is an amenable number.
21074868 is an abundant number, since it is smaller than the sum of its proper divisors (32197806).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21074868 is a wasteful number, since it uses less digits than its factorization.
21074868 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 585423 (or 585418 counting only the distinct ones).
The product of its (nonzero) digits is 21504, while the sum is 36.
The square root of 21074868 is about 4590.7371957018. The cubic root of 21074868 is about 276.2198940732.
It can be divided in two parts, 210 and 74868, that added together give a triangular number (75078 = T387).
The spelling of 21074868 in words is "twenty-one million, seventy-four thousand, eight hundred sixty-eight".
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