121643831520000 has 2160 divisors, whose sum is σ = 484792120612800. Its totient is φ = 29217914880000.

The previous prime is 121643831519933. The next prime is 121643831520037. The reversal of 121643831520000 is 25138346121.

121643831520000 is a `hidden beast` number, since 1 + 2 + 1 + 6 + 438 + 3 + 15 + 200 + 0 + 0 = 666.

It is a super-2 number, since 2×121643831520000² (a number of 29 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 39379678456 + ... + 39379681544.

It is an arithmetic number, because the mean of its divisors is an integer number (224440796580).

Almost surely, 2^{121643831520000} is an apocalyptic number.

121643831520000 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 121643831520000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (242396060306400).

121643831520000 is an abundant number, since it is smaller than the sum of its proper divisors (363148289092800).

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

121643831520000 is a wasteful number, since it uses less digits than its factorization.

121643831520000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3224 (or 3192 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

Adding to 121643831520000 its reverse (25138346121), we get a palindrome (121668969866121).

The spelling of 121643831520000 in words is "one hundred twenty-one trillion, six hundred forty-three billion, eight hundred thirty-one million, five hundred twenty thousand".