121912560 has 320 divisors, whose sum is σ = 524252160. Its totient is φ = 25297920.

The previous prime is 121912547. The next prime is 121912577. The reversal of 121912560 is 65219121.

121912560 is a `hidden beast` number, since 12 + 1 + 91 + 2 + 560 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 63 ways as a sum of consecutive naturals, for example, 165954 + ... + 166686.

It is an arithmetic number, because the mean of its divisors is an integer number (1638288).

Almost surely, 2^121912560 is an apocalyptic number.

121912560 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 121912560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (262126080).

121912560 is an abundant number, since it is smaller than the sum of its proper divisors (402339600).

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

121912560 is a wasteful number, since it uses less digits than its factorization.

121912560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 773 (or 761 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 121912560 is about 11041.4020848803. The cubic root of 121912560 is about 495.8490478899.

The spelling of 121912560 in words is "one hundred twenty-one million, nine hundred twelve thousand, five hundred sixty".