671110211721 has 8 divisors (see below), whose sum is σ = 894844520640. Its totient is φ = 447391355312.

The previous prime is 671110211659. The next prime is 671110211771. The reversal of 671110211721 is 127112011176.

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

It is a cyclic number.

It is not a de Polignac number, because 671110211721 - 2⁶ = 671110211657 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (671110211771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3761406 + ... + 3935783.

It is an arithmetic number, because the mean of its divisors is an integer number (111855565080).

Almost surely, 2^671110211721 is an apocalyptic number.

It is an amenable number.

671110211721 is a deficient number, since it is larger than the sum of its proper divisors (223734308919).

671110211721 is a wasteful number, since it uses less digits than its factorization.

671110211721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7726255.

The product of its (nonzero) digits is 1176, while the sum is 30.

Adding to 671110211721 its reverse (127112011176), we get a palindrome (798222222897).

The spelling of 671110211721 in words is "six hundred seventy-one billion, one hundred ten million, two hundred eleven thousand, seven hundred twenty-one".