121173220 has 48 divisors (see below), whose sum is σ = 293569920. Its totient is φ = 41151744.

The previous prime is 121173209. The next prime is 121173257. The reversal of 121173220 is 22371121.

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, 10936 + ... + 19024.

It is an arithmetic number, because the mean of its divisors is an integer number (6116040).

Almost surely, 2^121173220 is an apocalyptic number.

121173220 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 121173220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146784960).

121173220 is an abundant number, since it is smaller than the sum of its proper divisors (172396700).

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

121173220 is a wasteful number, since it uses less digits than its factorization.

121173220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8212 (or 8210 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 121173220 is about 11007.8708204630. The cubic root of 121173220 is about 494.8446541744.

The spelling of 121173220 in words is "one hundred twenty-one million, one hundred seventy-three thousand, two hundred twenty".