221201211212 has 12 divisors (see below), whose sum is σ = 387476862696. Its totient is φ = 110493536160.

The previous prime is 221201211199. The next prime is 221201211239. The reversal of 221201211212 is 212112102122.

221201211212 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 26762714 + ... + 26770977.

It is an arithmetic number, because the mean of its divisors is an integer number (32289738558).

Almost surely, 2^221201211212 is an apocalyptic number.

It is an amenable number.

221201211212 is a deficient number, since it is larger than the sum of its proper divisors (166275651484).

221201211212 is a wasteful number, since it uses less digits than its factorization.

221201211212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53534728 (or 53534726 counting only the distinct ones).

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

Adding to 221201211212 its reverse (212112102122), we get a palindrome (433313313334).

The spelling of 221201211212 in words is "two hundred twenty-one billion, two hundred one million, two hundred eleven thousand, two hundred twelve".