121020280 has 64 divisors (see below), whose sum is σ = 297665280. Its totient is φ = 44083200.

The previous prime is 121020257. The next prime is 121020293. The reversal of 121020280 is 82020121.

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 15 ways as a sum of consecutive naturals, for example, 18210 + ... + 23950.

It is an arithmetic number, because the mean of its divisors is an integer number (4651020).

Almost surely, 2^121020280 is an apocalyptic number.

121020280 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 121020280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (148832640).

121020280 is an abundant number, since it is smaller than the sum of its proper divisors (176645000).

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

121020280 is a wasteful number, since it uses less digits than its factorization.

121020280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5800 (or 5796 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 121020280 is about 11000.9217795601. The cubic root of 121020280 is about 494.6363754681.

The spelling of 121020280 in words is "one hundred twenty-one million, twenty thousand, two hundred eighty".