221211221200212 has 12 divisors (see below), whose sum is σ = 516159516133856. Its totient is φ = 73737073733400.

The previous prime is 221211221200199. The next prime is 221211221200243. The reversal of 221211221200212 is 212002122112122.

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

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 9217134216664 + ... + 9217134216687.

Almost surely, 2^{221211221200212} is an apocalyptic number.

It is an amenable number.

221211221200212 is an abundant number, since it is smaller than the sum of its proper divisors (294948294933644).

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

221211221200212 is a wasteful number, since it uses less digits than its factorization.

221211221200212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18434268433358 (or 18434268433356 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 221211221200212 its reverse (212002122112122), we get a palindrome (433213343312334).

The spelling of 221211221200212 in words is "two hundred twenty-one trillion, two hundred eleven billion, two hundred twenty-one million, two hundred thousand, two hundred twelve".