221210111111212 has 24 divisors (see below), whose sum is σ = 387150378965280. Its totient is φ = 110595717611520.

The previous prime is 221210111111189. The next prime is 221210111111239. The reversal of 221210111111212 is 212111111012122.

It is a self number, because there is not a number n which added to its sum of digits gives 221210111111212.

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 in 7 ways as a sum of consecutive naturals, for example, 3648074158 + ... + 3648134794.

It is an arithmetic number, because the mean of its divisors is an integer number (16131265790220).

Almost surely, 2^{221210111111212} is an apocalyptic number.

It is an amenable number.

221210111111212 is a deficient number, since it is larger than the sum of its proper divisors (165940267854068).

221210111111212 is a wasteful number, since it uses less digits than its factorization.

221210111111212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122601 (or 122599 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 221210111111212 its reverse (212111111012122), we get a palindrome (433321222123334).

The spelling of 221210111111212 in words is "two hundred twenty-one trillion, two hundred ten billion, one hundred eleven million, one hundred eleven thousand, two hundred twelve".