210042 has 24 divisors (see below), whose sum is σ = 520416. Its totient is φ = 59976.

The previous prime is 210037. The next prime is 210053. The reversal of 210042 is 240012.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a plaindrome in base 16.

It is an unprimeable number.

210042 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 11 ways as a sum of consecutive naturals, for example, 708 + ... + 959.

It is an arithmetic number, because the mean of its divisors is an integer number (21684).

2²¹⁰⁰⁴² is an apocalyptic number.

210042 is an abundant number, since it is smaller than the sum of its proper divisors (310374).

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

210042 is a wasteful number, since it uses less digits than its factorization.

210042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1682 (or 1679 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 210042 is about 458.3033929615. The cubic root of 210042 is about 59.4431818781.

Adding to 210042 its reverse (240012), we get a palindrome (450054).

The spelling of 210042 in words is "two hundred ten thousand, forty-two", and thus it is an iban number.