212212210221 has 24 divisors (see below), whose sum is σ = 334411424256. Its totient is φ = 128607143040.

The previous prime is 212212210201. The next prime is 212212210261. The reversal of 212212210221 is 122012212212.

It is a happy number.

212212210221 is a `hidden beast` number, since 2 + 1 + 221 + 221 + 0 + 221 = 666.

212212210221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 212212210221 - 2⁶ = 212212210157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212212210194 and 212212210203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212212210201) 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 23 ways as a sum of consecutive naturals, for example, 2691861 + ... + 2769573.

It is an arithmetic number, because the mean of its divisors is an integer number (13933809344).

Almost surely, 2^212212210221 is an apocalyptic number.

It is an amenable number.

212212210221 is a deficient number, since it is larger than the sum of its proper divisors (122199214035).

212212210221 is a wasteful number, since it uses less digits than its factorization.

212212210221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105313 (or 105310 counting only the distinct ones).

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

Adding to 212212210221 its reverse (122012212212), we get a palindrome (334224422433).

The spelling of 212212210221 in words is "two hundred twelve billion, two hundred twelve million, two hundred ten thousand, two hundred twenty-one".