71807394021 has 16 divisors (see below), whose sum is σ = 104476735488. Its totient is φ = 43507292400.

The previous prime is 71807394017. The next prime is 71807394049. The reversal of 71807394021 is 12049370817.

It is not a de Polignac number, because 71807394021 - 2² = 71807394017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71807394091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 189685 + ... + 423786.

It is an arithmetic number, because the mean of its divisors is an integer number (6529795968).

Almost surely, 2^71807394021 is an apocalyptic number.

It is an amenable number.

71807394021 is a deficient number, since it is larger than the sum of its proper divisors (32669341467).

71807394021 is a wasteful number, since it uses less digits than its factorization.

71807394021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617032.

The product of its (nonzero) digits is 84672, while the sum is 42.

The spelling of 71807394021 in words is "seventy-one billion, eight hundred seven million, three hundred ninety-four thousand, twenty-one".