| Base | Representation |
|---|---|
| bin | 101000111110… |
| … | …1011001000100 |
| 3 | 1111102120001100 |
| 4 | 1101331121010 |
| 5 | 21000010444 |
| 6 | 2044300100 |
| 7 | 350422563 |
| oct | 121753104 |
| 9 | 44376040 |
| 10 | 21485124 |
| 11 | 11145101 |
| 12 | 7241630 |
| 13 | 45b33bb |
| 14 | 2bd3bda |
| 15 | 1d45e69 |
| hex | 147d644 |
21485124 has 72 divisors (see below), whose sum is σ = 57919680. Its totient is φ = 6696000.
The previous prime is 21485119. The next prime is 21485129. The reversal of 21485124 is 42158412.
21485124 is a `hidden beast` number, since 2 + 148 + 512 + 4 = 666.
It is an interprime number because it is at equal distance from previous prime (21485119) and next prime (21485129).
It is a super-2 number, since 2×214851242 = 923221106590752, which contains 22 as substring.
It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.
It is not an unprimeable number, because it can be changed into a prime (21485129) by changing a digit.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 68929 + ... + 69239.
It is an arithmetic number, because the mean of its divisors is an integer number (804440).
Almost surely, 221485124 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 21485124, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28959840).
21485124 is an abundant number, since it is smaller than the sum of its proper divisors (36434556).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21485124 is a wasteful number, since it uses less digits than its factorization.
21485124 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 441 (or 436 counting only the distinct ones).
The product of its digits is 2560, while the sum is 27.
The square root of 21485124 is about 4635.2048498421. The cubic root of 21485124 is about 278.0007418506. Note that the first 3 decimals are identical.
It can be divided in two parts, 21485 and 124, that added together give a square (21609 = 1472).
The spelling of 21485124 in words is "twenty-one million, four hundred eighty-five thousand, one hundred twenty-four".
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