71318565021 has 8 divisors (see below), whose sum is σ = 103736094624. Its totient is φ = 43223372720.

The previous prime is 71318565011. The next prime is 71318565023. The reversal of 71318565021 is 12056581317.

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

It is not a de Polignac number, because 71318565021 - 2¹⁰ = 71318563997 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71318565023) 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, 1080584286 + ... + 1080584351.

It is an arithmetic number, because the mean of its divisors is an integer number (12967011828).

Almost surely, 2^71318565021 is an apocalyptic number.

It is an amenable number.

71318565021 is a deficient number, since it is larger than the sum of its proper divisors (32417529603).

71318565021 is a wasteful number, since it uses less digits than its factorization.

71318565021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2161168651.

The product of its (nonzero) digits is 50400, while the sum is 39.

The spelling of 71318565021 in words is "seventy-one billion, three hundred eighteen million, five hundred sixty-five thousand, twenty-one".