221131112106 has 16 divisors (see below), whose sum is σ = 442386532800. Its totient is φ = 73689652608.

The previous prime is 221131112099. The next prime is 221131112107. The reversal of 221131112106 is 601211131122.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221131112107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5156391 + ... + 5199098.

It is an arithmetic number, because the mean of its divisors is an integer number (27649158300).

Almost surely, 2^221131112106 is an apocalyptic number.

221131112106 is an abundant number, since it is smaller than the sum of its proper divisors (221255420694).

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

221131112106 is a wasteful number, since it uses less digits than its factorization.

221131112106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10359053.

The product of its (nonzero) digits is 144, while the sum is 21.

Adding to 221131112106 its reverse (601211131122), we get a palindrome (822342243228).

The spelling of 221131112106 in words is "two hundred twenty-one billion, one hundred thirty-one million, one hundred twelve thousand, one hundred six".