210842 has 8 divisors (see below), whose sum is σ = 323136. Its totient is φ = 103132.

The previous prime is 210839. The next prime is 210853. The reversal of 210842 is 248012.

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

It is a plaindrome in base 11 and base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 210842.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1028 + ... + 1215.

It is an arithmetic number, because the mean of its divisors is an integer number (40392).

2²¹⁰⁸⁴² is an apocalyptic number.

210842 is a deficient number, since it is larger than the sum of its proper divisors (112294).

210842 is a wasteful number, since it uses less digits than its factorization.

210842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2292.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 210842 is about 459.1753477703. The cubic root of 210842 is about 59.5185545786.

Adding to 210842 its reverse (248012), we get a palindrome (458854).

The spelling of 210842 in words is "two hundred ten thousand, eight hundred forty-two".