212221000012 has 48 divisors (see below), whose sum is σ = 449991339840. Its totient is φ = 85490860032.

The previous prime is 212220999997. The next prime is 212221000031. The reversal of 212221000012 is 210000122212.

It is a happy number.

212221000012 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 212220999956 and 212221000001.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79564 + ... + 656332.

It is an arithmetic number, because the mean of its divisors is an integer number (9374819580).

Almost surely, 2^212221000012 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212221000012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (224995669920).

212221000012 is an abundant number, since it is smaller than the sum of its proper divisors (237770339828).

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

212221000012 is a wasteful number, since it uses less digits than its factorization.

212221000012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577570 (or 577568 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 212221000012 its reverse (210000122212), we get a palindrome (422221122224).

The spelling of 212221000012 in words is "two hundred twelve billion, two hundred twenty-one million, twelve", and thus it is an aban number.