121796569440 has 1728 divisors, whose sum is σ = 559412904960. Its totient is φ = 23549460480.

The previous prime is 121796569439. The next prime is 121796569451. The reversal of 121796569440 is 44965697121.

121796569440 is a `hidden beast` number, since 1 + 2 + 1 + 79 + 6 + 569 + 4 + 4 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 1715444605 + ... + 1715444675.

It is an arithmetic number, because the mean of its divisors is an integer number (323734320).

Almost surely, 2^121796569440 is an apocalyptic number.

121796569440 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 121796569440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (279706452480).

121796569440 is an abundant number, since it is smaller than the sum of its proper divisors (437616335520).

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

121796569440 is a wasteful number, since it uses less digits than its factorization.

121796569440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197 (or 173 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 54.

The spelling of 121796569440 in words is "one hundred twenty-one billion, seven hundred ninety-six million, five hundred sixty-nine thousand, four hundred forty".