121583220 has 72 divisors (see below), whose sum is σ = 374217312. Its totient is φ = 29472960.

The previous prime is 121583207. The next prime is 121583257. The reversal of 121583220 is 22385121.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 1114 + ... + 15633.

Almost surely, 2^121583220 is an apocalyptic number.

121583220 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 121583220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (187108656).

121583220 is an abundant number, since it is smaller than the sum of its proper divisors (252634092).

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

121583220 is a wasteful number, since it uses less digits than its factorization.

121583220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16781 (or 16768 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 121583220 is about 11026.4781322052. The cubic root of 121583220 is about 495.4021423434.

The spelling of 121583220 in words is "one hundred twenty-one million, five hundred eighty-three thousand, two hundred twenty".