8221212 has 36 divisors (see below), whose sum is σ = 21687120. Its totient is φ = 2620992.

The previous prime is 8221211. The next prime is 8221219. The reversal of 8221212 is 2121228.

It is a happy number.

8221212 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8221211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4137 + ... + 5792.

It is an arithmetic number, because the mean of its divisors is an integer number (602420).

Almost surely, 2^8221212 is an apocalyptic number.

It is an amenable number.

8221212 is an abundant number, since it is smaller than the sum of its proper divisors (13465908).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8221212 is a wasteful number, since it uses less digits than its factorization.

8221212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9962 (or 9957 counting only the distinct ones).

The product of its digits is 128, while the sum is 18.

The square root of 8221212 is about 2867.2655963479. The cubic root of 8221212 is about 201.8266984032.

The spelling of 8221212 in words is "eight million, two hundred twenty-one thousand, two hundred twelve".