221200221212 has 6 divisors (see below), whose sum is σ = 387100387128. Its totient is φ = 110600110604.

The previous prime is 221200221211. The next prime is 221200221269. The reversal of 221200221212 is 212122002122.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221200221211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27650027648 + ... + 27650027655.

It is an arithmetic number, because the mean of its divisors is an integer number (64516731188).

Almost surely, 2^221200221212 is an apocalyptic number.

It is an amenable number.

221200221212 is a deficient number, since it is larger than the sum of its proper divisors (165900165916).

221200221212 is a wasteful number, since it uses less digits than its factorization.

221200221212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55300055307 (or 55300055305 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 221200221212 its reverse (212122002122), we get a palindrome (433322223334).

The spelling of 221200221212 in words is "two hundred twenty-one billion, two hundred million, two hundred twenty-one thousand, two hundred twelve".