210442 has 8 divisors (see below), whose sum is σ = 323136. Its totient is φ = 102732.

The previous prime is 210437. The next prime is 210461. The reversal of 210442 is 244012.

210442 is nontrivially palindromic in base 7.

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

It is an unprimeable number.

210442 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 3 ways as a sum of consecutive naturals, for example, 1138 + ... + 1309.

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

2²¹⁰⁴⁴² is an apocalyptic number.

210442 is a deficient number, since it is larger than the sum of its proper divisors (112694).

210442 is a wasteful number, since it uses less digits than its factorization.

210442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2492.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 210442 is about 458.7395775383. The cubic root of 210442 is about 59.4808921060.

Adding to 210442 its reverse (244012), we get a palindrome (454454).

The spelling of 210442 in words is "two hundred ten thousand, four hundred forty-two", and thus it is an iban number.