| Base | Representation |
|---|---|
| bin | 101001001110… |
| … | …0001101001100 |
| 3 | 1111122222012000 |
| 4 | 1102130031030 |
| 5 | 21013030330 |
| 6 | 2051112300 |
| 7 | 351456552 |
| oct | 122341514 |
| 9 | 44588160 |
| 10 | 21611340 |
| 11 | 11220a13 |
| 12 | 72a2690 |
| 13 | 462899a |
| 14 | 2c27bd2 |
| 15 | 1d6d560 |
| hex | 149c34c |
21611340 has 96 divisors (see below), whose sum is σ = 69457920. Its totient is φ = 5572800.
The previous prime is 21611323. The next prime is 21611347. The reversal of 21611340 is 4311612.
It is a happy number.
21611340 is a `hidden beast` number, since 21 + 611 + 34 + 0 = 666.
It is a Harshad number since it is a multiple of its sum of digits (18).
It is not an unprimeable number, because it can be changed into a prime (21611347) by changing a digit.
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 31 ways as a sum of consecutive naturals, for example, 16095 + ... + 17385.
It is an arithmetic number, because the mean of its divisors is an integer number (723520).
Almost surely, 221611340 is an apocalyptic number.
21611340 is a gapful number since it is divisible by the number (20) 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 21611340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34728960).
21611340 is an abundant number, since it is smaller than the sum of its proper divisors (47846580).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21611340 is a wasteful number, since it uses less digits than its factorization.
21611340 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1340 (or 1332 counting only the distinct ones).
The product of its (nonzero) digits is 144, while the sum is 18.
The square root of 21611340 is about 4648.7998451213. The cubic root of 21611340 is about 278.5440581731.
Adding to 21611340 its reverse (4311612), we get a palindrome (25922952).
It can be divided in two parts, 216113 and 40, that added together give a triangular number (216153 = T657).
The spelling of 21611340 in words is "twenty-one million, six hundred eleven thousand, three hundred forty".
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