121751280 has 480 divisors, whose sum is σ = 522288000. Its totient is φ = 25288704.

The previous prime is 121751257. The next prime is 121751281. The reversal of 121751280 is 82157121.

It is a Saint-Exupery number, since it is equal to the product of the sides of a Pythagorean triangle: 1015 × 119 × 1008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121751281) by changing a digit.

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 95 ways as a sum of consecutive naturals, for example, 4198306 + ... + 4198334.

It is an arithmetic number, because the mean of its divisors is an integer number (1088100).

Almost surely, 2^121751280 is an apocalyptic number.

121751280 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 121751280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (261144000).

121751280 is an abundant number, since it is smaller than the sum of its proper divisors (400536720).

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

121751280 is a wasteful number, since it uses less digits than its factorization.

121751280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86 (or 63 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 27.

The square root of 121751280 is about 11034.0962475411. The cubic root of 121751280 is about 495.6302959551.

The spelling of 121751280 in words is "one hundred twenty-one million, seven hundred fifty-one thousand, two hundred eighty".