12211220221212 has 96 divisors (see below), whose sum is σ = 30907991052288. Its totient is φ = 3737632144384.

The previous prime is 12211220221201. The next prime is 12211220221217. The reversal of 12211220221212 is 21212202211221.

It is a super-2 number, since 2×12211220221212² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211220221217) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1030573 + ... + 5048219.

It is an arithmetic number, because the mean of its divisors is an integer number (321958240128).

Almost surely, 2^{12211220221212} is an apocalyptic number.

12211220221212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12211220221212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15453995526144).

12211220221212 is an abundant number, since it is smaller than the sum of its proper divisors (18696770831076).

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

12211220221212 is a wasteful number, since it uses less digits than its factorization.

12211220221212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4018035 (or 4018033 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 12211220221212 its reverse (21212202211221), we get a palindrome (33423422432433).

The spelling of 12211220221212 in words is "twelve trillion, two hundred eleven billion, two hundred twenty million, two hundred twenty-one thousand, two hundred twelve".