12220121221212 has 48 divisors (see below), whose sum is σ = 28806563665152. Its totient is φ = 4031568376320.

The previous prime is 12220121221159. The next prime is 12220121221283. The reversal of 12220121221212 is 21212212102221.

It is a super-2 number, since 2×12220121221212² (a number of 27 digits) contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 557589 + ... + 4975052.

It is an arithmetic number, because the mean of its divisors is an integer number (600136743024).

Almost surely, 2^{12220121221212} is an apocalyptic number.

12220121221212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12220121221212 is an abundant number, since it is smaller than the sum of its proper divisors (16586442443940).

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

12220121221212 is a wasteful number, since it uses less digits than its factorization.

12220121221212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5534538 (or 5534536 counting only the distinct ones).

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

Adding to 12220121221212 its reverse (21212212102221), we get a palindrome (33432333323433).

The spelling of 12220121221212 in words is "twelve trillion, two hundred twenty billion, one hundred twenty-one million, two hundred twenty-one thousand, two hundred twelve".