42571121857 has 8 divisors (see below), whose sum is σ = 47696392512. Its totient is φ = 37655046000.

The previous prime is 42571121833. The next prime is 42571121867. The reversal of 42571121857 is 75812117524.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42571121857 - 2¹¹ = 42571119809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42571121807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52298269 + ... + 52299082.

It is an arithmetic number, because the mean of its divisors is an integer number (5962049064).

Almost surely, 2^42571121857 is an apocalyptic number.

It is an amenable number.

42571121857 is a deficient number, since it is larger than the sum of its proper divisors (5125270655).

42571121857 is a wasteful number, since it uses less digits than its factorization.

42571121857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104597399.

The product of its digits is 156800, while the sum is 43.

The spelling of 42571121857 in words is "forty-two billion, five hundred seventy-one million, one hundred twenty-one thousand, eight hundred fifty-seven".