121281280 has 72 divisors (see below), whose sum is σ = 297720864. Its totient is φ = 47308800.

The previous prime is 121281229. The next prime is 121281283. The reversal of 121281280 is 82182121.

It is not an unprimeable number, because it can be changed into a prime (121281283) 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, 51325 + ... + 53635.

It is an arithmetic number, because the mean of its divisors is an integer number (4135012).

Almost surely, 2^121281280 is an apocalyptic number.

121281280 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 121281280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (148860432).

121281280 is an abundant number, since it is smaller than the sum of its proper divisors (176439584).

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

121281280 is an equidigital number, since it uses as much as digits as its factorization.

121281280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2373 (or 2359 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 25.

The square root of 121281280 is about 11012.7780328126. The cubic root of 121281280 is about 494.9917081902.

The spelling of 121281280 in words is "one hundred twenty-one million, two hundred eighty-one thousand, two hundred eighty".