12121220220000 has 480 divisors, whose sum is σ = 40153426790400. Its totient is φ = 3200469504000.

The previous prime is 12121220219971. The next prime is 12121220220007. The reversal of 12121220220000 is 2202212121.

It is a tau number, because it is divible by the number of its divisors (480).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121220220007) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 3608578321 + ... + 3608581679.

It is an arithmetic number, because the mean of its divisors is an integer number (83652972480).

Almost surely, 2^{12121220220000} is an apocalyptic number.

12121220220000 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 12121220220000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20076713395200).

12121220220000 is an abundant number, since it is smaller than the sum of its proper divisors (28032206570400).

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

12121220220000 is a wasteful number, since it uses less digits than its factorization.

12121220220000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3968 (or 3945 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 12121220220000 its reverse (2202212121), we get a palindrome (12123422432121).

The spelling of 12121220220000 in words is "twelve trillion, one hundred twenty-one billion, two hundred twenty million, two hundred twenty thousand".