21192 has 16 divisors (see below), whose sum is σ = 53040. Its totient is φ = 7056.

The previous prime is 21191. The next prime is 21193. The reversal of 21192 is 29112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21191) and next prime (21193).

It is a nialpdrome in base 13.

It is a zygodrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (21191) 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, 418 + ... + 465.

It is an arithmetic number, because the mean of its divisors is an integer number (3315).

2²¹¹⁹² is an apocalyptic number.

It is an amenable number.

21192 is an abundant number, since it is smaller than the sum of its proper divisors (31848).

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 (26520).

21192 is a wasteful number, since it uses less digits than its factorization.

21192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 892 (or 888 counting only the distinct ones).

The product of its digits is 36, while the sum is 15.

The square root of 21192 is about 145.5747230806. The cubic root of 21192 is about 27.6730683078.

It can be divided in two parts, 211 and 92, that added together give a palindrome (303).

The spelling of 21192 in words is "twenty-one thousand, one hundred ninety-two".