221211201212 has 12 divisors (see below), whose sum is σ = 387993464376. Its totient is φ = 110355925680.

The previous prime is 221211201209. The next prime is 221211201221. The reversal of 221211201212 is 212102112122.

221211201212 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62416739 + ... + 62420282.

It is an arithmetic number, because the mean of its divisors is an integer number (32332788698).

Almost surely, 2^221211201212 is an apocalyptic number.

It is an amenable number.

221211201212 is a deficient number, since it is larger than the sum of its proper divisors (166782263164).

221211201212 is a wasteful number, since it uses less digits than its factorization.

221211201212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124837468 (or 124837466 counting only the distinct ones).

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

Adding to 221211201212 its reverse (212102112122), we get a palindrome (433313313334).

The spelling of 221211201212 in words is "two hundred twenty-one billion, two hundred eleven million, two hundred one thousand, two hundred twelve".