221212101112 has 64 divisors (see below), whose sum is σ = 441621784800. Its totient is φ = 103520256000.

The previous prime is 221212101101. The next prime is 221212101113. The reversal of 221212101112 is 211101212122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221212101113) 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 15 ways as a sum of consecutive naturals, for example, 22968714 + ... + 22978342.

Almost surely, 2^221212101112 is an apocalyptic number.

It is an amenable number.

221212101112 is a deficient number, since it is larger than the sum of its proper divisors (220409683688).

221212101112 is a wasteful number, since it uses less digits than its factorization.

221212101112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10576 (or 10572 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 221212101112 its reverse (211101212122), we get a palindrome (432313313234).

The spelling of 221212101112 in words is "two hundred twenty-one billion, two hundred twelve million, one hundred one thousand, one hundred twelve".