121752105520 has 40 divisors (see below), whose sum is σ = 299725039584. Its totient is φ = 45836086272.

The previous prime is 121752105481. The next prime is 121752105521. The reversal of 121752105520 is 25501257121.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (121752105521) 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 7 ways as a sum of consecutive naturals, for example, 44760444 + ... + 44763163.

Almost surely, 2^121752105520 is an apocalyptic number.

121752105520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121752105520 is an abundant number, since it is smaller than the sum of its proper divisors (177972934064).

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

121752105520 is a wasteful number, since it uses less digits than its factorization.

121752105520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89523637 (or 89523631 counting only the distinct ones).

The product of its (nonzero) digits is 7000, while the sum is 31.

The spelling of 121752105520 in words is "one hundred twenty-one billion, seven hundred fifty-two million, one hundred five thousand, five hundred twenty".