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21416648 = 23111912809
BaseRepresentation
bin101000110110…
…0101011001000
31111022002010012
41101230223020
520440313043
62043011052
7350016131
oct121545310
944262105
1021416648
11110a8710
127209a88
13458b196
142bb6c88
151d30a18
hex146cac8

21416648 has 32 divisors (see below), whose sum is σ = 46116000. Its totient is φ = 9221760.

The previous prime is 21416641. The next prime is 21416669. The reversal of 21416648 is 84661412.

It is not an unprimeable number, because it can be changed into a prime (21416641) 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 7 ways as a sum of consecutive naturals, for example, 4733 + ... + 8076.

It is an arithmetic number, because the mean of its divisors is an integer number (1441125).

Almost surely, 221416648 is an apocalyptic number.

It is an amenable number.

21416648 is an abundant number, since it is smaller than the sum of its proper divisors (24699352).

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

21416648 is a wasteful number, since it uses less digits than its factorization.

21416648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12845 (or 12841 counting only the distinct ones).

The product of its digits is 9216, while the sum is 32.

The square root of 21416648 is about 4627.8124421804. The cubic root of 21416648 is about 277.7050855239.

The spelling of 21416648 in words is "twenty-one million, four hundred sixteen thousand, six hundred forty-eight".

Divisors: 1 2 4 8 11 19 22 38 44 76 88 152 209 418 836 1672 12809 25618 51236 102472 140899 243371 281798 486742 563596 973484 1127192 1946968 2677081 5354162 10708324 21416648