21182 has 16 divisors (see below), whose sum is σ = 38880. Its totient is φ = 8448.

The previous prime is 21179. The next prime is 21187. The reversal of 21182 is 28112.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21187) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 194 + ... + 282.

It is an arithmetic number, because the mean of its divisors is an integer number (2430).

2²¹¹⁸² is an apocalyptic number.

21182 is the 119-th pentagonal number.

21182 is a deficient number, since it is larger than the sum of its proper divisors (17698).

21182 is a wasteful number, since it uses less digits than its factorization.

21182 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115.

The product of its digits is 32, while the sum is 14.

The square root of 21182 is about 145.5403724057. The cubic root of 21182 is about 27.6687148691.

Adding to 21182 its reverse (28112), we get a palindrome (49294).

The spelling of 21182 in words is "twenty-one thousand, one hundred eighty-two".