42171811 has 32 divisors (see below), whose sum is σ = 52346880. Its totient is φ = 33501600.

The previous prime is 42171809. The next prime is 42171853. The reversal of 42171811 is 11817124.

It is not a de Polignac number, because 42171811 - 2¹ = 42171809 is a prime.

It is a Duffinian 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 31 ways as a sum of consecutive naturals, for example, 148876 + ... + 149158.

It is an arithmetic number, because the mean of its divisors is an integer number (1635840).

Almost surely, 2^42171811 is an apocalyptic number.

42171811 is a deficient number, since it is larger than the sum of its proper divisors (10175069).

42171811 is a wasteful number, since it uses less digits than its factorization.

42171811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367.

The product of its digits is 448, while the sum is 25.

The square root of 42171811 is about 6493.9826762935. The cubic root of 42171811 is about 348.0760034595.

Adding to 42171811 its reverse (11817124), we get a palindrome (53988935).

The spelling of 42171811 in words is "forty-two million, one hundred seventy-one thousand, eight hundred eleven".