121855523328 has 240 divisors, whose sum is σ = 438463561536. Its totient is φ = 31650693120.

The previous prime is 121855523291. The next prime is 121855523347. The reversal of 121855523328 is 823325558121.

121855523328 is a `hidden beast` number, since 1 + 21 + 85 + 5 + 523 + 3 + 28 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 183100 + ... + 526532.

Almost surely, 2^121855523328 is an apocalyptic number.

121855523328 is a gapful number since it is divisible by the number (18) 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 121855523328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (219231780768).

121855523328 is an abundant number, since it is smaller than the sum of its proper divisors (316608038208).

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

121855523328 is a wasteful number, since it uses less digits than its factorization.

121855523328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343475 (or 343456 counting only the distinct ones).

The product of its digits is 576000, while the sum is 45.

The spelling of 121855523328 in words is "one hundred twenty-one billion, eight hundred fifty-five million, five hundred twenty-three thousand, three hundred twenty-eight".