221100120212 has 6 divisors (see below), whose sum is σ = 386925210378. Its totient is φ = 110550060104.

The previous prime is 221100120209. The next prime is 221100120217. The reversal of 221100120212 is 212021001122.

It can be written as a sum of positive squares in only one way, i.e., 221063590276 + 36529936 = 470174^2 + 6044^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221100120217) by changing a digit.

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 as a sum of consecutive naturals, namely, 27637515023 + ... + 27637515030.

It is an arithmetic number, because the mean of its divisors is an integer number (64487535063).

Almost surely, 2^221100120212 is an apocalyptic number.

It is an amenable number.

221100120212 is a deficient number, since it is larger than the sum of its proper divisors (165825090166).

221100120212 is a wasteful number, since it uses less digits than its factorization.

221100120212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55275030057 (or 55275030055 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 221100120212 its reverse (212021001122), we get a palindrome (433121121334).

The spelling of 221100120212 in words is "two hundred twenty-one billion, one hundred million, one hundred twenty thousand, two hundred twelve".