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21330342 = 23211176337
BaseRepresentation
bin101000101011…
…1100110100110
31111010200201200
41101113212212
520430032332
62041103330
7346206405
oct121274646
944120650
1021330342
1111049890
127187b46
13455ab07
142b9363c
151d1517c
hex14579a6

21330342 has 48 divisors (see below), whose sum is σ = 53391312. Its totient is φ = 6082560.

The previous prime is 21330313. The next prime is 21330347. The reversal of 21330342 is 24303312.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21330347) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 198 + ... + 6534.

It is an arithmetic number, because the mean of its divisors is an integer number (1112319).

Almost surely, 221330342 is an apocalyptic number.

21330342 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21330342, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26695656).

21330342 is an abundant number, since it is smaller than the sum of its proper divisors (32060970).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21330342 is a wasteful number, since it uses less digits than its factorization.

21330342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6373 (or 6370 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 21330342 is about 4618.4783208325. The cubic root of 21330342 is about 277.3315461675.

Adding to 21330342 its reverse (24303312), we get a palindrome (45633654).

The spelling of 21330342 in words is "twenty-one million, three hundred thirty thousand, three hundred forty-two".

Divisors: 1 2 3 6 9 11 17 18 22 33 34 51 66 99 102 153 187 198 306 374 561 1122 1683 3366 6337 12674 19011 38022 57033 69707 107729 114066 139414 209121 215458 323187 418242 627363 646374 969561 1185019 1254726 1939122 2370038 3555057 7110114 10665171 21330342