117506871821 has 32 divisors (see below), whose sum is σ = 125952938496. Its totient is φ = 109384704000.

The previous prime is 117506871767. The next prime is 117506871883. The reversal of 117506871821 is 128178605711.

It is a cyclic number.

It is not a de Polignac number, because 117506871821 - 2¹⁰ = 117506870797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117506871121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56465501 + ... + 56467581.

It is an arithmetic number, because the mean of its divisors is an integer number (3936029328).

Almost surely, 2^117506871821 is an apocalyptic number.

It is an amenable number.

117506871821 is a deficient number, since it is larger than the sum of its proper divisors (8446066675).

117506871821 is a wasteful number, since it uses less digits than its factorization.

117506871821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2573.

The product of its (nonzero) digits is 188160, while the sum is 47.

The spelling of 117506871821 in words is "one hundred seventeen billion, five hundred six million, eight hundred seventy-one thousand, eight hundred twenty-one".