121220011220 has 144 divisors (see below), whose sum is σ = 324473107392. Its totient is φ = 37615656960.

The previous prime is 121220011217. The next prime is 121220011259. The reversal of 121220011220 is 22110022121.

121220011220 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×121220011220² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 121220011195 and 121220011204.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2422292 + ... + 2471828.

It is an arithmetic number, because the mean of its divisors is an integer number (2253285468).

Almost surely, 2^121220011220 is an apocalyptic number.

121220011220 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 121220011220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (162236553696).

121220011220 is an abundant number, since it is smaller than the sum of its proper divisors (203253096172).

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

121220011220 is a wasteful number, since it uses less digits than its factorization.

121220011220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49798 (or 49789 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 121220011220 its reverse (22110022121), we get a palindrome (143330033341).

The spelling of 121220011220 in words is "one hundred twenty-one billion, two hundred twenty million, eleven thousand, two hundred twenty".