221213212212 has 24 divisors (see below), whose sum is σ = 516322731456. Its totient is φ = 73715084608.

The previous prime is 221213212211. The next prime is 221213212247. The reversal of 221213212212 is 212212312122.

221213212212 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221213212211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2790888 + ... + 2869055.

It is an arithmetic number, because the mean of its divisors is an integer number (21513447144).

Almost surely, 2^221213212212 is an apocalyptic number.

It is an amenable number.

221213212212 is an abundant number, since it is smaller than the sum of its proper divisors (295109519244).

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

221213212212 is a wasteful number, since it uses less digits than its factorization.

221213212212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5663207 (or 5663205 counting only the distinct ones).

The product of its digits is 384, while the sum is 21.

Adding to 221213212212 its reverse (212212312122), we get a palindrome (433425524334).

The spelling of 221213212212 in words is "two hundred twenty-one billion, two hundred thirteen million, two hundred twelve thousand, two hundred twelve".