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21033342 = 23211195591
BaseRepresentation
bin101000000111…
…1000101111110
31110120121022200
41100033011332
520341031332
62030452330
7343531461
oct120170576
943517280
1021033342
1110966730
1270640a6
134485885
142b172d8
151ca717c
hex140f17e

21033342 has 48 divisors (see below), whose sum is σ = 52341120. Its totient is φ = 6037200.

The previous prime is 21033329. The next prime is 21033343. The reversal of 21033342 is 24333012.

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 (21033343) 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, 967 + ... + 6557.

It is an arithmetic number, because the mean of its divisors is an integer number (1090440).

Almost surely, 221033342 is an apocalyptic number.

21033342 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 21033342, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26170560).

21033342 is an abundant number, since it is smaller than the sum of its proper divisors (31307778).

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

21033342 is a wasteful number, since it uses less digits than its factorization.

21033342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5629 (or 5626 counting only the distinct ones).

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

The square root of 21033342 is about 4586.2121625586. The cubic root of 21033342 is about 276.0383532083.

Adding to 21033342 its reverse (24333012), we get a palindrome (45366354).

It can be divided in two parts, 2103 and 3342, that added together give a palindrome (5445).

The spelling of 21033342 in words is "twenty-one million, thirty-three thousand, three hundred forty-two".

Divisors: 1 2 3 6 9 11 18 19 22 33 38 57 66 99 114 171 198 209 342 418 627 1254 1881 3762 5591 11182 16773 33546 50319 61501 100638 106229 123002 184503 212458 318687 369006 553509 637374 956061 1107018 1168519 1912122 2337038 3505557 7011114 10516671 21033342