871221278192 has 20 divisors (see below), whose sum is σ = 1688362599336. Its totient is φ = 435514800960.

The previous prime is 871221278141. The next prime is 871221278197. The reversal of 871221278192 is 291872122178.

It is a happy number.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 871221278192.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (871221278197) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5914859 + ... + 6060362.

Almost surely, 2^871221278192 is an apocalyptic number.

It is an amenable number.

871221278192 is a deficient number, since it is larger than the sum of its proper divisors (817141321144).

871221278192 is a wasteful number, since it uses less digits than its factorization.

871221278192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11979776 (or 11979770 counting only the distinct ones).

The product of its digits is 451584, while the sum is 50.

The spelling of 871221278192 in words is "eight hundred seventy-one billion, two hundred twenty-one million, two hundred seventy-eight thousand, one hundred ninety-two".