Base | Representation |
---|---|
bin | 101000101001… |
… | …1011100100000 |
3 | 1111002211100221 |
4 | 1101103130200 |
5 | 20424011222 |
6 | 2040452424 |
7 | 346105636 |
oct | 121233440 |
9 | 44084327 |
10 | 21313312 |
11 | 11038009 |
12 | 717a114 |
13 | 4553137 |
14 | 2b8b356 |
15 | 1d100c7 |
hex | 1453720 |
21313312 has 12 divisors (see below), whose sum is σ = 41960646. Its totient is φ = 10656640.
The previous prime is 21313301. The next prime is 21313333. The reversal of 21313312 is 21331312.
It can be written as a sum of positive squares in only one way, i.e., 21123216 + 190096 = 4596^2 + 436^2 .
It is a Harshad number since it is a multiple of its sum of digits (16).
It is an unprimeable number.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332989 + ... + 333052.
Almost surely, 221313312 is an apocalyptic number.
It is an amenable number.
21313312 is a deficient number, since it is larger than the sum of its proper divisors (20647334).
21313312 is an equidigital number, since it uses as much as digits as its factorization.
21313312 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 666051 (or 666043 counting only the distinct ones).
The product of its digits is 108, while the sum is 16.
The square root of 21313312 is about 4616.6342718478. The cubic root of 21313312 is about 277.2577199764.
Adding to 21313312 its reverse (21331312), we get a palindrome (42644624).
The spelling of 21313312 in words is "twenty-one million, three hundred thirteen thousand, three hundred twelve".
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