121758912 has 126 divisors (see below), whose sum is σ = 383831084. Its totient is φ = 36875520.

The previous prime is 121758893. The next prime is 121758919. The reversal of 121758912 is 219857121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (121758919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 68823 + ... + 70569.

Almost surely, 2^121758912 is an apocalyptic number.

121758912 is a gapful number since it is divisible by the number (12) 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 121758912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (191915542).

121758912 is an abundant number, since it is smaller than the sum of its proper divisors (262072172).

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

121758912 is a wasteful number, since it uses less digits than its factorization.

121758912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1787 (or 1763 counting only the distinct ones).

The product of its digits is 10080, while the sum is 36.

The square root of 121758912 is about 11034.4420792354. The cubic root of 121758912 is about 495.6406519623.

The spelling of 121758912 in words is "one hundred twenty-one million, seven hundred fifty-eight thousand, nine hundred twelve".