121839655680 has 216 divisors, whose sum is σ = 437166689232. Its totient is φ = 32490491904.

The previous prime is 121839655627. The next prime is 121839655709. The reversal of 121839655680 is 86556938121.

121839655680 is a `hidden beast` number, since 1 + 2 + 1 + 8 + 3 + 9 + 6 + 556 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (216).

It is a Harshad number since it is a multiple of its sum of digits (54).

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 23 ways as a sum of consecutive naturals, for example, 115182 + ... + 506898.

Almost surely, 2^121839655680 is an apocalyptic number.

121839655680 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 121839655680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (218583344616).

121839655680 is an abundant number, since it is smaller than the sum of its proper divisors (315327033552).

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

121839655680 is an frugal number, since it uses more digits than its factorization.

121839655680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391753 (or 391727 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 54.

The spelling of 121839655680 in words is "one hundred twenty-one billion, eight hundred thirty-nine million, six hundred fifty-five thousand, six hundred eighty".