121647821884512 has 432 divisors, whose sum is σ = 415219795220160. Its totient is φ = 31061288670720.

The previous prime is 121647821884493. The next prime is 121647821884559. The reversal of 121647821884512 is 215488128746121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 31770643 + ... + 35393069.

It is an arithmetic number, because the mean of its divisors is an integer number (961156933380).

Almost surely, 2^{121647821884512} is an apocalyptic number.

121647821884512 is a gapful number since it is divisible by the number (12) 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 121647821884512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (207609897610080).

121647821884512 is an abundant number, since it is smaller than the sum of its proper divisors (293571973335648).

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

121647821884512 is a wasteful number, since it uses less digits than its factorization.

121647821884512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3622535 (or 3622509 counting only the distinct ones).

The product of its digits is 13762560, while the sum is 60.

The spelling of 121647821884512 in words is "one hundred twenty-one trillion, six hundred forty-seven billion, eight hundred twenty-one million, eight hundred eighty-four thousand, five hundred twelve".