121112220 has 48 divisors (see below), whose sum is σ = 340250400. Its totient is φ = 32188416.

The previous prime is 121112203. The next prime is 121112263. The reversal of 121112220 is 22211121.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 121112196 and 121112205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15556 + ... + 22004.

It is an arithmetic number, because the mean of its divisors is an integer number (7088550).

Almost surely, 2^121112220 is an apocalyptic number.

121112220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121112220 is an abundant number, since it is smaller than the sum of its proper divisors (219138180).

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

121112220 is a wasteful number, since it uses less digits than its factorization.

121112220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6774 (or 6772 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 121112220 is about 11005.0997269448. The cubic root of 121112220 is about 494.7616033964.

Adding to 121112220 its reverse (22211121), we get a palindrome (143323341).

It can be divided in two parts, 1211 and 12220, that added together give a palindrome (13431).

The spelling of 121112220 in words is "one hundred twenty-one million, one hundred twelve thousand, two hundred twenty".