121387840000 has 400 divisors, whose sum is σ = 354049267968. Its totient is φ = 40697856000.

The previous prime is 121387839971. The next prime is 121387840037. The reversal of 121387840000 is 48783121.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (400).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 105279424 + ... + 105280576.

Almost surely, 2^121387840000 is an apocalyptic number.

121387840000 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 121387840000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (177024633984).

121387840000 is an abundant number, since it is smaller than the sum of its proper divisors (232661427968).

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

121387840000 is an frugal number, since it uses more digits than its factorization.

121387840000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1245 (or 1214 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 34.

The spelling of 121387840000 in words is "one hundred twenty-one billion, three hundred eighty-seven million, eight hundred forty thousand".