221000212 has 6 divisors (see below), whose sum is σ = 386750378. Its totient is φ = 110500104.

The previous prime is 221000141. The next prime is 221000243. The reversal of 221000212 is 212000122.

It can be written as a sum of positive squares in only one way, i.e., 145588356 + 75411856 = 12066^2 + 8684^2 .

It is a congruent number.

It is an unprimeable number.

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, 27625023 + ... + 27625030.

Almost surely, 2^221000212 is an apocalyptic number.

It is an amenable number.

221000212 is a deficient number, since it is larger than the sum of its proper divisors (165750166).

221000212 is a wasteful number, since it uses less digits than its factorization.

221000212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55250057 (or 55250055 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 221000212 is about 14866.0758776484. The cubic root of 221000212 is about 604.5945529255.

Adding to 221000212 its reverse (212000122), we get a palindrome (433000334).

The spelling of 221000212 in words is "two hundred twenty-one million, two hundred twelve", and thus it is an aban number.