211686538117 has 8 divisors (see below), whose sum is σ = 235935460800. Its totient is φ = 188748368064.

The previous prime is 211686538103. The next prime is 211686538153. The reversal of 211686538117 is 711835686112.

It is a happy number.

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 211686538117 - 2²⁷ = 211552320389 is a prime.

It is a super-2 number, since 2×211686538117² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211686538417) 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, 327687817 + ... + 327688462.

It is an arithmetic number, because the mean of its divisors is an integer number (29491932600).

Almost surely, 2^211686538117 is an apocalyptic number.

It is an amenable number.

211686538117 is a deficient number, since it is larger than the sum of its proper divisors (24248922683).

211686538117 is a wasteful number, since it uses less digits than its factorization.

211686538117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655376315.

The product of its digits is 483840, while the sum is 49.

The spelling of 211686538117 in words is "two hundred eleven billion, six hundred eighty-six million, five hundred thirty-eight thousand, one hundred seventeen".