42171721713 has 32 divisors (see below), whose sum is σ = 68168179200. Its totient is φ = 25554171600.

The previous prime is 42171721679. The next prime is 42171721717. The reversal of 42171721713 is 31712717124.

42171721713 is a `hidden beast` number, since 421 + 7 + 1 + 7 + 217 + 13 = 666.

It is not a de Polignac number, because 42171721713 - 2⁸ = 42171721457 is a prime.

It is a super-2 number, since 2×42171721713² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42171721717) 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 31 ways as a sum of consecutive naturals, for example, 2692218 + ... + 2707836.

It is an arithmetic number, because the mean of its divisors is an integer number (2130255600).

Almost surely, 2^42171721713 is an apocalyptic number.

It is an amenable number.

42171721713 is a deficient number, since it is larger than the sum of its proper divisors (25996457487).

42171721713 is a wasteful number, since it uses less digits than its factorization.

42171721713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24730 (or 24724 counting only the distinct ones).

The product of its digits is 16464, while the sum is 36.

The spelling of 42171721713 in words is "forty-two billion, one hundred seventy-one million, seven hundred twenty-one thousand, seven hundred thirteen".