211686538116 has 12 divisors (see below), whose sum is σ = 493935255632. Its totient is φ = 70562179368.

The previous prime is 211686538103. The next prime is 211686538153. The reversal of 211686538116 is 611835686112.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×211686538116² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8820272410 + ... + 8820272433.

Almost surely, 2^211686538116 is an apocalyptic number.

It is an amenable number.

211686538116 is an abundant number, since it is smaller than the sum of its proper divisors (282248717516).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211686538116 is a wasteful number, since it uses less digits than its factorization.

211686538116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17640544850 (or 17640544848 counting only the distinct ones).

The product of its digits is 414720, while the sum is 48.

The spelling of 211686538116 in words is "two hundred eleven billion, six hundred eighty-six million, five hundred thirty-eight thousand, one hundred sixteen".