121220121220 has 192 divisors, whose sum is σ = 305425209600. Its totient is φ = 39916800000.

The previous prime is 121220121193. The next prime is 121220121251. The reversal of 121220121220 is 22121022121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 121220121194 and 121220121203.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12238270 + ... + 12248170.

It is an arithmetic number, because the mean of its divisors is an integer number (1590756300).

Almost surely, 2^121220121220 is an apocalyptic number.

121220121220 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 121220121220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (152712604800).

121220121220 is an abundant number, since it is smaller than the sum of its proper divisors (184205088380).

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

121220121220 is a wasteful number, since it uses less digits than its factorization.

121220121220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10070 (or 10068 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 121220121220 its reverse (22121022121), we get a palindrome (143341143341).

Subtracting from 121220121220 its reverse (22121022121), we obtain a palindrome (99099099099).

The spelling of 121220121220 in words is "one hundred twenty-one billion, two hundred twenty million, one hundred twenty-one thousand, two hundred twenty".