12222212121020 has 96 divisors (see below), whose sum is σ = 29018454958080. Its totient is φ = 4283338026240.

The previous prime is 12222212120917. The next prime is 12222212121047. The reversal of 12222212121020 is 2012121222221.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 12222212120983 and 12222212121001.

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 31 ways as a sum of consecutive naturals, for example, 1738757 + ... + 5240963.

It is an arithmetic number, because the mean of its divisors is an integer number (302275572480).

Almost surely, 2^{12222212121020} is an apocalyptic number.

12222212121020 is a gapful number since it is divisible by the number (10) 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 12222212121020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14509227479040).

12222212121020 is an abundant number, since it is smaller than the sum of its proper divisors (16796242837060).

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

12222212121020 is a wasteful number, since it uses less digits than its factorization.

12222212121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3502803 (or 3502801 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 12222212121020 its reverse (2012121222221), we get a palindrome (14234333343241).

The spelling of 12222212121020 in words is "twelve trillion, two hundred twenty-two billion, two hundred twelve million, one hundred twenty-one thousand, twenty".