121110212220 has 24 divisors (see below), whose sum is σ = 339108594384. Its totient is φ = 32296056576.

The previous prime is 121110212207. The next prime is 121110212221. The reversal of 121110212220 is 22212011121.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 121110212220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121110212221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1009251709 + ... + 1009251828.

It is an arithmetic number, because the mean of its divisors is an integer number (14129524766).

Almost surely, 2^121110212220 is an apocalyptic number.

121110212220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121110212220 is an abundant number, since it is smaller than the sum of its proper divisors (217998382164).

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

121110212220 is a wasteful number, since it uses less digits than its factorization.

121110212220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2018503549 (or 2018503547 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 121110212220 its reverse (22212011121), we get a palindrome (143322223341).

The spelling of 121110212220 in words is "one hundred twenty-one billion, one hundred ten million, two hundred twelve thousand, two hundred twenty".