221111110212 has 12 divisors (see below), whose sum is σ = 515925923856. Its totient is φ = 73703703400.

The previous prime is 221111110211. The next prime is 221111110289. The reversal of 221111110212 is 212011111122.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 221111110191 and 221111110200.

It is not an unprimeable number, because it can be changed into a prime (221111110211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9212962914 + ... + 9212962937.

It is an arithmetic number, because the mean of its divisors is an integer number (42993826988).

Almost surely, 2^221111110212 is an apocalyptic number.

It is an amenable number.

221111110212 is an abundant number, since it is smaller than the sum of its proper divisors (294814813644).

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

221111110212 is a wasteful number, since it uses less digits than its factorization.

221111110212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18425925858 (or 18425925856 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 221111110212 its reverse (212011111122), we get a palindrome (433122221334).

The spelling of 221111110212 in words is "two hundred twenty-one billion, one hundred eleven million, one hundred ten thousand, two hundred twelve".