210942 has 12 divisors (see below), whose sum is σ = 457080. Its totient is φ = 70308.

The previous prime is 210929. The next prime is 210943. The reversal of 210942 is 249012.

210942 is nontrivially palindromic in base 5.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 11719 = 210942 / (2 + 1 + 0 + 9 + 4 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210943) by changing a digit.

210942 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5842 + ... + 5877.

It is an arithmetic number, because the mean of its divisors is an integer number (38090).

2²¹⁰⁹⁴² is an apocalyptic number.

210942 is an abundant number, since it is smaller than the sum of its proper divisors (246138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

210942 is a wasteful number, since it uses less digits than its factorization.

210942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11727 (or 11724 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 210942 is about 459.2842257252. The cubic root of 210942 is about 59.5279627527.

Adding to 210942 its reverse (249012), we get a palindrome (459954).

The spelling of 210942 in words is "two hundred ten thousand, nine hundred forty-two".