| Base | Representation |
|---|---|
| bin | 101000100111… |
| … | …1100001111100 |
| 3 | 1111002000101000 |
| 4 | 1101033201330 |
| 5 | 20423003101 |
| 6 | 2040250300 |
| 7 | 346011120 |
| oct | 121174174 |
| 9 | 44060330 |
| 10 | 21297276 |
| 11 | 11026a60 |
| 12 | 7170990 |
| 13 | 4548a50 |
| 14 | 2b85580 |
| 15 | 1d0a486 |
| hex | 144f87c |
21297276 has 192 divisors, whose sum is σ = 74511360. Its totient is φ = 5080320.
The previous prime is 21297259. The next prime is 21297293. The reversal of 21297276 is 67279212.
21297276 = T363 + T364 + ... + T559.
It is an interprime number because it is at equal distance from previous prime (21297259) and next prime (21297293).
It is a Harshad number since it is a multiple of its sum of digits (36).
It is a nude number because it is divisible by every one of its digits.
It is a self number, because there is not a number n which added to its sum of digits gives 21297276.
It is a congruent number.
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 63 ways as a sum of consecutive naturals, for example, 108010 + ... + 108206.
It is an arithmetic number, because the mean of its divisors is an integer number (388080).
Almost surely, 221297276 is an apocalyptic number.
21297276 is a gapful number since it is divisible by the number (26) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 21297276, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37255680).
21297276 is an abundant number, since it is smaller than the sum of its proper divisors (53214084).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21297276 is a wasteful number, since it uses less digits than its factorization.
21297276 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 241 (or 233 counting only the distinct ones).
The product of its digits is 21168, while the sum is 36.
The square root of 21297276 is about 4614.8971819532. The cubic root of 21297276 is about 277.1881668830.
The spelling of 21297276 in words is "twenty-one million, two hundred ninety-seven thousand, two hundred seventy-six".
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