21322 has 8 divisors (see below), whose sum is σ = 36576. Its totient is φ = 9132.

The previous prime is 21319. The next prime is 21323. The reversal of 21322 is 22312.

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

It is a pancake number, because a pancake can be divided into 21322 parts by 206 straight cuts.

It is a nialpdrome in base 9 and base 13.

It is a zygodrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 21299 and 21308.

It is not an unprimeable number, because it can be changed into a prime (21323) 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, 748 + ... + 775.

It is an arithmetic number, because the mean of its divisors is an integer number (4572).

2²¹³²² is an apocalyptic number.

21322 is a deficient number, since it is larger than the sum of its proper divisors (15254).

21322 is a wasteful number, since it uses less digits than its factorization.

It is an anagram of its base 9 representation: 21322 = (32221)₉.

21322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1532.

The product of its digits is 24, while the sum is 10.

The square root of 21322 is about 146.0205464995. The cubic root of 21322 is about 27.7295387950.

Subtracting from 21322 its sum of digits (10), we obtain a palindrome (21312).

Adding to 21322 its reverse (22312), we get a palindrome (43634).

Subtracting 21322 from its reverse (22312), we obtain a triangular number (990 = T₄₄).

It can be divided in two parts, 21 and 322, that added together give a palindrome (343).

The spelling of 21322 in words is "twenty-one thousand, three hundred twenty-two", and thus it is an iban number.