211686012220 has 24 divisors (see below), whose sum is σ = 445683420000. Its totient is φ = 84456729792.

The previous prime is 211686012217. The next prime is 211686012221. The reversal of 211686012220 is 22210686112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211686012221) 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, 13596720 + ... + 13612279.

It is an arithmetic number, because the mean of its divisors is an integer number (18570142500).

Almost surely, 2^211686012220 is an apocalyptic number.

211686012220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211686012220 is an abundant number, since it is smaller than the sum of its proper divisors (233997407780).

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

211686012220 is a wasteful number, since it uses less digits than its factorization.

211686012220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27209397 (or 27209395 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

Adding to 211686012220 its reverse (22210686112), we get a palindrome (233896698332).

The spelling of 211686012220 in words is "two hundred eleven billion, six hundred eighty-six million, twelve thousand, two hundred twenty".