212221120660 has 24 divisors (see below), whose sum is σ = 446169106656. Its totient is φ = 84792304800.

The previous prime is 212221120649. The next prime is 212221120679. The reversal of 212221120660 is 66021122212.

212221120660 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5990866 + ... + 6026185.

It is an arithmetic number, because the mean of its divisors is an integer number (18590379444).

Almost surely, 2^212221120660 is an apocalyptic number.

212221120660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212221120660 is an abundant number, since it is smaller than the sum of its proper divisors (233947985996).

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

212221120660 is a wasteful number, since it uses less digits than its factorization.

212221120660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12017943 (or 12017941 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

Adding to 212221120660 its reverse (66021122212), we get a palindrome (278242242872).

The spelling of 212221120660 in words is "two hundred twelve billion, two hundred twenty-one million, one hundred twenty thousand, six hundred sixty".