121220221221120 has 144 divisors (see below), whose sum is σ = 442453807555200. Its totient is φ = 27707479130112.

The previous prime is 121220221221089. The next prime is 121220221221221. The reversal of 121220221221120 is 21122122022121.

It is a Harshad number since it is a multiple of its sum of digits (21).

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, 2254813545 + ... + 2254867304.

It is an arithmetic number, because the mean of its divisors is an integer number (3072595885800).

Almost surely, 2^{121220221221120} is an apocalyptic number.

121220221221120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121220221221120 is an abundant number, since it is smaller than the sum of its proper divisors (321233586334080).

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

121220221221120 is an equidigital number, since it uses as much as digits as its factorization.

121220221221120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4509680880 (or 4509680866 counting only the distinct ones).

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

Adding to 121220221221120 its reverse (21122122022121), we get a palindrome (142342343243241).

The spelling of 121220221221120 in words is "one hundred twenty-one trillion, two hundred twenty billion, two hundred twenty-one million, two hundred twenty-one thousand, one hundred twenty".