121255120 has 80 divisors (see below), whose sum is σ = 323729280. Its totient is φ = 41375232.

The previous prime is 121255111. The next prime is 121255171. The reversal of 121255120 is 21552121.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 163711 + ... + 164449.

It is an arithmetic number, because the mean of its divisors is an integer number (4046616).

Almost surely, 2^121255120 is an apocalyptic number.

121255120 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 121255120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161864640).

121255120 is an abundant number, since it is smaller than the sum of its proper divisors (202474160).

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

121255120 is a wasteful number, since it uses less digits than its factorization.

121255120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1052 (or 1046 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 121255120 is about 11011.5902575423. The cubic root of 121255120 is about 494.9561162334.

The spelling of 121255120 in words is "one hundred twenty-one million, two hundred fifty-five thousand, one hundred twenty".