12221212212 has 288 divisors, whose sum is σ = 37168395264. Its totient is φ = 3342643200.

The previous prime is 12221212187. The next prime is 12221212247. The reversal of 12221212212 is 21221212221.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 32764458 + ... + 32764830.

It is an arithmetic number, because the mean of its divisors is an integer number (129056928).

Almost surely, 2^12221212212 is an apocalyptic number.

12221212212 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 12221212212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18584197632).

12221212212 is an abundant number, since it is smaller than the sum of its proper divisors (24947183052).

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

12221212212 is a wasteful number, since it uses less digits than its factorization.

12221212212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 599 (or 594 counting only the distinct ones).

The product of its digits is 128, while the sum is 18.

Adding to 12221212212 its reverse (21221212221), we get a palindrome (33442424433).

Subtracting 12221212212 from its reverse (21221212221), we obtain a palindrome (9000000009).

The spelling of 12221212212 in words is "twelve billion, two hundred twenty-one million, two hundred twelve thousand, two hundred twelve".