42218371 has 4 divisors (see below), whose sum is σ = 45465952. Its totient is φ = 38970792.

The previous prime is 42218359. The next prime is 42218381. The reversal of 42218371 is 17381224.

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

It is a cyclic number.

It is not a de Polignac number, because 42218371 - 2⁵ = 42218339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42218321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1623771 + ... + 1623796.

It is an arithmetic number, because the mean of its divisors is an integer number (11366488).

Almost surely, 2^42218371 is an apocalyptic number.

42218371 is a deficient number, since it is larger than the sum of its proper divisors (3247581).

42218371 is a wasteful number, since it uses less digits than its factorization.

42218371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3247580.

The product of its digits is 2688, while the sum is 28.

The square root of 42218371 is about 6497.5665444842. The cubic root of 42218371 is about 348.2040546998.

Adding to 42218371 its reverse (17381224), we get a palindrome (59599595).

The spelling of 42218371 in words is "forty-two million, two hundred eighteen thousand, three hundred seventy-one".