42105242 has 4 divisors (see below), whose sum is σ = 63157866. Its totient is φ = 21052620.

The previous prime is 42105229. The next prime is 42105247. The reversal of 42105242 is 24250124.

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., 33396841 + 8708401 = 5779^2 + 2951^2 .

It is not an unprimeable number, because it can be changed into a prime (42105247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10526309 + ... + 10526312.

Almost surely, 2^42105242 is an apocalyptic number.

42105242 is a deficient number, since it is larger than the sum of its proper divisors (21052624).

42105242 is a wasteful number, since it uses less digits than its factorization.

42105242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21052623.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 42105242 is about 6488.8552149050. The cubic root of 42105242 is about 347.8927588258.

Adding to 42105242 its reverse (24250124), we get a palindrome (66355366).

The spelling of 42105242 in words is "forty-two million, one hundred five thousand, two hundred forty-two".