21332 has 6 divisors (see below), whose sum is σ = 37338. Its totient is φ = 10664.

The previous prime is 21323. The next prime is 21341. The reversal of 21332 is 23312.

It is an interprime number because it is at equal distance from previous prime (21323) and next prime (21341).

It can be written as a sum of positive squares in only one way, i.e., 21316 + 16 = 146^2 + 4^2 .

It is a congruent number.

It is an unprimeable number.

21332 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 as a sum of consecutive naturals, namely, 2663 + ... + 2670.

It is an arithmetic number, because the mean of its divisors is an integer number (6223).

2²¹³³² is an apocalyptic number.

It is an amenable number.

21332 is a deficient number, since it is larger than the sum of its proper divisors (16006).

21332 is a wasteful number, since it uses less digits than its factorization.

21332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5337 (or 5335 counting only the distinct ones).

The product of its digits is 36, while the sum is 11.

The square root of 21332 is about 146.0547842421. The cubic root of 21332 is about 27.7338731609.

Subtracting from 21332 its sum of digits (11), we obtain a triangular number (21321 = T₂₀₆).

Adding to 21332 its reverse (23312), we get a palindrome (44644).

It can be divided in two parts, 21 and 332, that added together give a palindrome (353).

The spelling of 21332 in words is "twenty-one thousand, three hundred thirty-two".