210542 has 12 divisors (see below), whose sum is σ = 331800. Its totient is φ = 100188.

The previous prime is 210533. The next prime is 210557. The reversal of 210542 is 245012.

210542 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

210542 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 (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 959 + ... + 1157.

It is an arithmetic number, because the mean of its divisors is an integer number (27650).

2²¹⁰⁵⁴² is an apocalyptic number.

210542 is a deficient number, since it is larger than the sum of its proper divisors (121258).

210542 is a wasteful number, since it uses less digits than its factorization.

210542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247 (or 224 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 210542 is about 458.8485588950. The cubic root of 210542 is about 59.4903121953.

Adding to 210542 its reverse (245012), we get a palindrome (455554).

It can be divided in two parts, 2105 and 42, that multiplied together give a triangular number (88410 = T₄₂₀).

The spelling of 210542 in words is "two hundred ten thousand, five hundred forty-two".