211686538115 has 8 divisors (see below), whose sum is σ = 273564141648. Its totient is φ = 156322366560.

The previous prime is 211686538103. The next prime is 211686538153. The reversal of 211686538115 is 511835686112.

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

It is not a de Polignac number, because 211686538115 - 2¹² = 211686534019 is a prime.

It is a super-2 number, since 2×211686538115² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211686538115.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1628357921 + ... + 1628358050.

It is an arithmetic number, because the mean of its divisors is an integer number (34195517706).

Almost surely, 2^211686538115 is an apocalyptic number.

211686538115 is a deficient number, since it is larger than the sum of its proper divisors (61877603533).

211686538115 is a wasteful number, since it uses less digits than its factorization.

211686538115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3256715989.

The product of its digits is 345600, while the sum is 47.

The spelling of 211686538115 in words is "two hundred eleven billion, six hundred eighty-six million, five hundred thirty-eight thousand, one hundred fifteen".