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21702 = 233617

21702 has 8 divisors (see below), whose sum is σ = 43416. Its totient is φ = 7232.

The previous prime is 21701. The next prime is 21713. The reversal of 21702 is 20712.

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

21702 is an admirable number.

It is a plaindrome in base 15.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 21702.

It is not an unprimeable number, because it can be changed into a prime (21701) 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, 1803 + ... + 1814.

It is an arithmetic number, because the mean of its divisors is an integer number (5427).

221702 is an apocalyptic number.

21702 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21708).

21702 is a wasteful number, since it uses less digits than its factorization.

21702 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3622.

The product of its (nonzero) digits is 28, while the sum is 12.

The square root of 21702 is about 147.3159869125. The cubic root of 21702 is about 27.8933014070.

Subtracting from 21702 its reverse (20712), we obtain a triangular number (990 = T44).

The spelling of 21702 in words is "twenty-one thousand, seven hundred two", and thus it is an iban number.

Divisors: 1 2 3 6 3617 7234 10851 21702