21298 has 8 divisors (see below), whose sum is σ = 33408. Its totient is φ = 10164.

The previous prime is 21283. The next prime is 21313. The reversal of 21298 is 89212.

It is an interprime number because it is at equal distance from previous prime (21283) and next prime (21313).

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 nialpdrome in base 16.

It is an unprimeable number.

21298 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 186 + ... + 277.

It is an arithmetic number, because the mean of its divisors is an integer number (4176).

2²¹²⁹⁸ is an apocalyptic number.

21298 is a deficient number, since it is larger than the sum of its proper divisors (12110).

21298 is a wasteful number, since it uses less digits than its factorization.

21298 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488.

The product of its digits is 288, while the sum is 22.

The square root of 21298 is about 145.9383431453. The cubic root of 21298 is about 27.7191307847.

The spelling of 21298 in words is "twenty-one thousand, two hundred ninety-eight".