210530042 has 4 divisors (see below), whose sum is σ = 315795066. Its totient is φ = 105265020.

The previous prime is 210530011. The next prime is 210530069. The reversal of 210530042 is 240035012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 119880601 + 90649441 = 10949^2 + 9521^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 210530042.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52632509 + ... + 52632512.

Almost surely, 2^210530042 is an apocalyptic number.

210530042 is a deficient number, since it is larger than the sum of its proper divisors (105265024).

210530042 is a wasteful number, since it uses less digits than its factorization.

210530042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105265023.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 210530042 is about 14509.6534073009. The cubic root of 210530042 is about 594.8918589804.

Adding to 210530042 its reverse (240035012), we get a palindrome (450565054).

The spelling of 210530042 in words is "two hundred ten million, five hundred thirty thousand, forty-two".