212021113221 has 32 divisors (see below), whose sum is σ = 330721536000. Its totient is φ = 133873921584.

The previous prime is 212021113193. The next prime is 212021113223. The reversal of 212021113221 is 122311120212.

212021113221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-212021113221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212021113194 and 212021113203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212021113223) 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 31 ways as a sum of consecutive naturals, for example, 2041866 + ... + 2143188.

It is an arithmetic number, because the mean of its divisors is an integer number (10335048000).

Almost surely, 2^212021113221 is an apocalyptic number.

It is an amenable number.

212021113221 is a deficient number, since it is larger than the sum of its proper divisors (118700422779).

212021113221 is a wasteful number, since it uses less digits than its factorization.

212021113221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105430 (or 105424 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 212021113221 its reverse (122311120212), we get a palindrome (334332233433).

The spelling of 212021113221 in words is "two hundred twelve billion, twenty-one million, one hundred thirteen thousand, two hundred twenty-one".