21410 has 8 divisors (see below), whose sum is σ = 38556. Its totient is φ = 8560.

The previous prime is 21407. The next prime is 21419. The reversal of 21410 is 1412.

It can be written as a sum of positive squares in 2 ways, for example, as 20449 + 961 = 143^2 + 31^2 .

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

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21419) 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, 1061 + ... + 1080.

2²¹⁴¹⁰ is an apocalyptic number.

21410 is a deficient number, since it is larger than the sum of its proper divisors (17146).

21410 is a wasteful number, since it uses less digits than its factorization.

21410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2148.

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 21410 is about 146.3215636877. The cubic root of 21410 is about 27.7676348153.

Adding to 21410 its reverse (1412), we get a palindrome (22822).

The spelling of 21410 in words is "twenty-one thousand, four hundred ten", and thus it is an iban number.