221102212 has 6 divisors (see below), whose sum is σ = 386928878. Its totient is φ = 110551104.

The previous prime is 221102191. The next prime is 221102213. The reversal of 221102212 is 212201122.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 213627456 + 7474756 = 14616^2 + 2734^2 .

It is a junction number, because it is equal to n+sod(n) for n = 221102192 and 221102201.

It is not an unprimeable number, because it can be changed into a prime (221102213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27637773 + ... + 27637780.

Almost surely, 2^221102212 is an apocalyptic number.

It is an amenable number.

221102212 is a deficient number, since it is larger than the sum of its proper divisors (165826666).

221102212 is a wasteful number, since it uses less digits than its factorization.

221102212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55275557 (or 55275555 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 221102212 is about 14869.5061115022. The cubic root of 221102212 is about 604.6875530766.

Adding to 221102212 its reverse (212201122), we get a palindrome (433303334).

The spelling of 221102212 in words is "two hundred twenty-one million, one hundred two thousand, two hundred twelve".