11212221120212 has 72 divisors (see below), whose sum is σ = 24176272708224. Its totient is φ = 4520938399488.

The previous prime is 11212221120187. The next prime is 11212221120227. The reversal of 11212221120212 is 21202112221211.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8611583 + ... + 9827705.

It is an arithmetic number, because the mean of its divisors is an integer number (335781565392).

Almost surely, 2^{11212221120212} 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 11212221120212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12088136354112).

11212221120212 is an abundant number, since it is smaller than the sum of its proper divisors (12964051588012).

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

11212221120212 is a wasteful number, since it uses less digits than its factorization.

11212221120212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1218925 (or 1218916 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 11212221120212 its reverse (21202112221211), we get a palindrome (32414333341423).

The spelling of 11212221120212 in words is "eleven trillion, two hundred twelve billion, two hundred twenty-one million, one hundred twenty thousand, two hundred twelve".