12121220221220 has 24 divisors (see below), whose sum is σ = 27768613598208. Its totient is φ = 4407716444000.

The previous prime is 12121220221217. The next prime is 12121220221321. The reversal of 12121220221220 is 2212202212121.

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 = 12121220221192 and 12121220221201.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27548227556 + ... + 27548227995.

It is an arithmetic number, because the mean of its divisors is an integer number (1157025566592).

Almost surely, 2^{12121220221220} is an apocalyptic number.

12121220221220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12121220221220 is an abundant number, since it is smaller than the sum of its proper divisors (15647393376988).

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

12121220221220 is a wasteful number, since it uses less digits than its factorization.

12121220221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55096455571 (or 55096455569 counting only the distinct ones).

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

Adding to 12121220221220 its reverse (2212202212121), we get a palindrome (14333422433341).

The spelling of 12121220221220 in words is "twelve trillion, one hundred twenty-one billion, two hundred twenty million, two hundred twenty-one thousand, two hundred twenty".