121101220 has 24 divisors (see below), whose sum is σ = 256785984. Its totient is φ = 47969376.

The previous prime is 121101203. The next prime is 121101229. The reversal of 121101220 is 22101121.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 121101197 and 121101206.

It is not an unprimeable number, because it can be changed into a prime (121101229) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 27334 + ... + 31453.

It is an arithmetic number, because the mean of its divisors is an integer number (10699416).

Almost surely, 2^121101220 is an apocalyptic number.

121101220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121101220 is an abundant number, since it is smaller than the sum of its proper divisors (135684764).

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

121101220 is a wasteful number, since it uses less digits than its factorization.

121101220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58899 (or 58897 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 121101220 is about 11004.5999472948. The cubic root of 121101220 is about 494.7466240590.

Adding to 121101220 its reverse (22101121), we get a palindrome (143202341).

Subtracting from 121101220 its reverse (22101121), we obtain a palindrome (99000099).

The spelling of 121101220 in words is "one hundred twenty-one million, one hundred one thousand, two hundred twenty".