221111220212 has 6 divisors (see below), whose sum is σ = 386944635378. Its totient is φ = 110555610104.

The previous prime is 221111220193. The next prime is 221111220221. The reversal of 221111220212 is 212022111122.

It can be written as a sum of positive squares in only one way, i.e., 210640609936 + 10470610276 = 458956^2 + 102326^2 .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 27638902523 + ... + 27638902530.

It is an arithmetic number, because the mean of its divisors is an integer number (64490772563).

Almost surely, 2^221111220212 is an apocalyptic number.

It is an amenable number.

221111220212 is a deficient number, since it is larger than the sum of its proper divisors (165833415166).

221111220212 is a wasteful number, since it uses less digits than its factorization.

221111220212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55277805057 (or 55277805055 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221111220212 its reverse (212022111122), we get a palindrome (433133331334).

The spelling of 221111220212 in words is "two hundred twenty-one billion, one hundred eleven million, two hundred twenty thousand, two hundred twelve".