42171071 has 4 divisors (see below), whose sum is σ = 42474600. Its totient is φ = 41867544.

The previous prime is 42171061. The next prime is 42171091. The reversal of 42171071 is 17017124.

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 42171071 - 2¹⁴ = 42154687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42171011) 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, 151556 + ... + 151833.

It is an arithmetic number, because the mean of its divisors is an integer number (10618650).

Almost surely, 2^42171071 is an apocalyptic number.

42171071 is a deficient number, since it is larger than the sum of its proper divisors (303529).

42171071 is a wasteful number, since it uses less digits than its factorization.

42171071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303528.

The product of its (nonzero) digits is 392, while the sum is 23.

The square root of 42171071 is about 6493.9257002217. The cubic root of 42171071 is about 348.0739675201.

Adding to 42171071 its reverse (17017124), we get a palindrome (59188195).

The spelling of 42171071 in words is "forty-two million, one hundred seventy-one thousand, seventy-one".