212211212121 has 16 divisors (see below), whose sum is σ = 314394803520. Its totient is φ = 141470621280.

The previous prime is 212211212119. The next prime is 212211212137. The reversal of 212211212121 is 121212112212.

212211212121 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 212211212121 - 2¹ = 212211212119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212211212094 and 212211212103.

It is not an unprimeable number, because it can be changed into a prime (212211212111) 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 15 ways as a sum of consecutive naturals, for example, 1456821 + ... + 1595853.

It is an arithmetic number, because the mean of its divisors is an integer number (19649675220).

Almost surely, 2^212211212121 is an apocalyptic number.

It is an amenable number.

212211212121 is a deficient number, since it is larger than the sum of its proper divisors (102183591399).

212211212121 is a wasteful number, since it uses less digits than its factorization.

212211212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195573 (or 195567 counting only the distinct ones).

The product of its digits is 64, while the sum is 18.

Adding to 212211212121 its reverse (121212112212), we get a palindrome (333423324333).

Subtracting from 212211212121 its reverse (121212112212), we obtain a palindrome (90999099909).

The spelling of 212211212121 in words is "two hundred twelve billion, two hundred eleven million, two hundred twelve thousand, one hundred twenty-one".