121155558960 has 80 divisors (see below), whose sum is σ = 375615673344. Its totient is φ = 32305272576.

The previous prime is 121155558959. The next prime is 121155558967. The reversal of 121155558960 is 69855551121.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (121155558967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5269249 + ... + 5292191.

Almost surely, 2^121155558960 is an apocalyptic number.

121155558960 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121155558960 is an abundant number, since it is smaller than the sum of its proper divisors (254460114384).

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

121155558960 is a wasteful number, since it uses less digits than its factorization.

121155558960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44962 (or 44956 counting only the distinct ones).

The product of its (nonzero) digits is 540000, while the sum is 48.

The spelling of 121155558960 in words is "one hundred twenty-one billion, one hundred fifty-five million, five hundred fifty-eight thousand, nine hundred sixty".