42210242 has 4 divisors (see below), whose sum is σ = 63315366. Its totient is φ = 21105120.

The previous prime is 42210239. The next prime is 42210247. The reversal of 42210242 is 24201224.

It is a happy number.

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., 40081561 + 2128681 = 6331^2 + 1459^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 42210242.

It is not an unprimeable number, because it can be changed into a prime (42210247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10552559 + ... + 10552562.

Almost surely, 2^42210242 is an apocalyptic number.

42210242 is a deficient number, since it is larger than the sum of its proper divisors (21105124).

42210242 is a wasteful number, since it uses less digits than its factorization.

42210242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21105123.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 42210242 is about 6496.9409724885. The cubic root of 42210242 is about 348.1817047734.

Adding to 42210242 its reverse (24201224), we get a palindrome (66411466).

The spelling of 42210242 in words is "forty-two million, two hundred ten thousand, two hundred forty-two".