221211111986 has 16 divisors (see below), whose sum is σ = 333087054720. Its totient is φ = 110182206960.

The previous prime is 221211111983. The next prime is 221211112007. The reversal of 221211111986 is 689111112122.

It is not an unprimeable number, because it can be changed into a prime (221211111983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4604240 + ... + 4652036.

It is an arithmetic number, because the mean of its divisors is an integer number (20817940920).

Almost surely, 2^221211111986 is an apocalyptic number.

221211111986 is a deficient number, since it is larger than the sum of its proper divisors (111875942734).

221211111986 is a wasteful number, since it uses less digits than its factorization.

221211111986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56609.

The product of its digits is 3456, while the sum is 35.

The spelling of 221211111986 in words is "two hundred twenty-one billion, two hundred eleven million, one hundred eleven thousand, nine hundred eighty-six".