42442171 has 2 divisors, whose sum is σ = 42442172. Its totient is φ = 42442170.

The previous prime is 42442163. The next prime is 42442187. The reversal of 42442171 is 17124424.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42442171 - 2³ = 42442163 is a prime.

It is not a weakly prime, because it can be changed into another prime (42442571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21221085 + 21221086.

It is an arithmetic number, because the mean of its divisors is an integer number (21221086).

Almost surely, 2^42442171 is an apocalyptic number.

42442171 is a deficient number, since it is larger than the sum of its proper divisors (1).

42442171 is an equidigital number, since it uses as much as digits as its factorization.

42442171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1792, while the sum is 25.

The square root of 42442171 is about 6514.7656135889. The cubic root of 42442171 is about 348.8182483991.

Adding to 42442171 its reverse (17124424), we get a palindrome (59566595).

The spelling of 42442171 in words is "forty-two million, four hundred forty-two thousand, one hundred seventy-one".