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21610 = 252161
BaseRepresentation
bin101010001101010
31002122101
411101222
51142420
6244014
7120001
oct52152
932571
1021610
1115266
121060a
139ab4
147c38
15660a
hex546a

21610 has 8 divisors (see below), whose sum is σ = 38916. Its totient is φ = 8640.

The previous prime is 21601. The next prime is 21611. The reversal of 21610 is 1612.

It is a Cunningham number, because it is equal to 1472+1.

It can be written as a sum of positive squares in 2 ways, for example, as 21609 + 1 = 147^2 + 1^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (10), and also a Moran number because the ratio is a prime number: 2161 = 21610 / (2 + 1 + 6 + 1 + 0).

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (21611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1071 + ... + 1090.

221610 is an apocalyptic number.

21610 is a deficient number, since it is larger than the sum of its proper divisors (17306).

21610 is a wasteful number, since it uses less digits than its factorization.

21610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2168.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 21610 is about 147.0034013212. The cubic root of 21610 is about 27.8538301061.

The spelling of 21610 in words is "twenty-one thousand, six hundred ten".

Divisors: 1 2 5 10 2161 4322 10805 21610