21602 has 8 divisors (see below), whose sum is σ = 37056. Its totient is φ = 9252.

The previous prime is 21601. The next prime is 21611. The reversal of 21602 is 20612.

21602 is nontrivially palindromic in base 13.

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

It is not an unprimeable number, because it can be changed into a prime (21601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 758 + ... + 785.

It is an arithmetic number, because the mean of its divisors is an integer number (4632).

21602 is a deficient number, since it is larger than the sum of its proper divisors (15454).

21602 is a wasteful number, since it uses less digits than its factorization.

21602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1552.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 21602 is about 146.9761885477. The cubic root of 21602 is about 27.8503925286.

Subtracting from 21602 its reverse (20612), we obtain a triangular number (990 = T₄₄).

The spelling of 21602 in words is "twenty-one thousand, six hundred two".