221021221200212 has 12 divisors (see below), whose sum is σ = 388750523584500. Its totient is φ = 109949643033216.

The previous prime is 221021221200083. The next prime is 221021221200223. The reversal of 221021221200212 is 212002122120122.

It can be written as a sum of positive squares in 2 ways, for example, as 176678221025296 + 44343000174916 = 13292036^2 + 6659054^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140241890837 + ... + 140241892412.

It is an arithmetic number, because the mean of its divisors is an integer number (32395876965375).

Almost surely, 2^{221021221200212} is an apocalyptic number.

It is an amenable number.

221021221200212 is a deficient number, since it is larger than the sum of its proper divisors (167729302384288).

221021221200212 is a wasteful number, since it uses less digits than its factorization.

221021221200212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280483783450 (or 280483783448 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 221021221200212 its reverse (212002122120122), we get a palindrome (433023343320334).

The spelling of 221021221200212 in words is "two hundred twenty-one trillion, twenty-one billion, two hundred twenty-one million, two hundred thousand, two hundred twelve".