121280 has 28 divisors (see below), whose sum is σ = 289560. Its totient is φ = 48384.

The previous prime is 121271. The next prime is 121283. The reversal of 121280 is 82121.

Added to its reverse (82121) it gives a square (203401 = 451²).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121283) by changing a digit.

121280 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131 + ... + 509.

2¹²¹²⁸⁰ is an apocalyptic number.

121280 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 121280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144780).

121280 is an abundant number, since it is smaller than the sum of its proper divisors (168280).

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

121280 is an equidigital number, since it uses as much as digits as its factorization.

121280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396 (or 386 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 121280 is about 348.2527817549. The cubic root of 121280 is about 49.4989966807.

Adding to 121280 its reverse (82121), we get a square (203401 = 451²).

The spelling of 121280 in words is "one hundred twenty-one thousand, two hundred eighty".