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21083328 = 26347283
BaseRepresentation
bin101000001101…
…1010011000000
31110200010220000
41100123103000
520344131303
62031520000
7344130300
oct120332300
943603800
1021083328
11109a0242
127089000
1344a2556
142b2b600
151cb6da3
hex141b4c0

21083328 has 210 divisors, whose sum is σ = 73577196. Its totient is φ = 5951232.

The previous prime is 21083291. The next prime is 21083333. The reversal of 21083328 is 82338012.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 253975 + ... + 254057.

Almost surely, 221083328 is an apocalyptic number.

21083328 is a gapful number since it is divisible by the number (28) 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 21083328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36788598).

21083328 is an abundant number, since it is smaller than the sum of its proper divisors (52493868).

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

21083328 is an equidigital number, since it uses as much as digits as its factorization.

21083328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121 (or 95 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 21083328 is about 4591.6585238887. The cubic root of 21083328 is about 276.2568497445.

It can be divided in two parts, 210 and 83328, that added together give a palindrome (83538).

The spelling of 21083328 in words is "twenty-one million, eighty-three thousand, three hundred twenty-eight".