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21092 has 6 divisors (see below), whose sum is σ = 36918. Its totient is φ = 10544.

The previous prime is 21089. The next prime is 21101. The reversal of 21092 is 29012.

It can be written as a sum of positive squares in only one way, i.e., 17956 + 3136 = 134^2 + 56^2 .

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 21092.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2633 + ... + 2640.

It is an arithmetic number, because the mean of its divisors is an integer number (6153).

221092 is an apocalyptic number.

It is an amenable number.

21092 is a deficient number, since it is larger than the sum of its proper divisors (15826).

21092 is a wasteful number, since it uses less digits than its factorization.

21092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5277 (or 5275 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 21092 is about 145.2308507171. The cubic root of 21092 is about 27.6294721232.

The spelling of 21092 in words is "twenty-one thousand, ninety-two".

Divisors: 1 2 4 5273 10546 21092