121123220 has 24 divisors (see below), whose sum is σ = 254759904. Its totient is φ = 48372896.

The previous prime is 121123193. The next prime is 121123229. The reversal of 121123220 is 22321121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 121123195 and 121123204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121123229) 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, 9227 + ... + 18093.

It is an arithmetic number, because the mean of its divisors is an integer number (10614996).

Almost surely, 2^121123220 is an apocalyptic number.

121123220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121123220 is an abundant number, since it is smaller than the sum of its proper divisors (133636684).

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

121123220 is a wasteful number, since it uses less digits than its factorization.

121123220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9559 (or 9557 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 121123220 is about 11005.5994838991. The cubic root of 121123220 is about 494.7765818268.

Adding to 121123220 its reverse (22321121), we get a palindrome (143444341).

The spelling of 121123220 in words is "one hundred twenty-one million, one hundred twenty-three thousand, two hundred twenty".