121781940000 has 240 divisors, whose sum is σ = 456537711168. Its totient is φ = 27835776000.

The previous prime is 121781939999. The next prime is 121781940019. The reversal of 121781940000 is 49187121.

It is a tau number, because it is divible by the number of its divisors (240).

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, 275022 + ... + 564978.

Almost surely, 2^121781940000 is an apocalyptic number.

121781940000 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 121781940000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (228268855584).

121781940000 is an abundant number, since it is smaller than the sum of its proper divisors (334755771168).

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

121781940000 is an equidigital number, since it uses as much as digits as its factorization.

121781940000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289997 (or 289974 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 33.

The spelling of 121781940000 in words is "one hundred twenty-one billion, seven hundred eighty-one million, nine hundred forty thousand".