121805130240 has 480 divisors, whose sum is σ = 441948963456. Its totient is φ = 32149094400.

The previous prime is 121805130217. The next prime is 121805130259. The reversal of 121805130240 is 42031508121.

121805130240 is a `hidden beast` number, since 121 + 8 + 0 + 513 + 0 + 24 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (480).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 64073290 + ... + 64075190.

Almost surely, 2^121805130240 is an apocalyptic number.

121805130240 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 121805130240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (220974481728).

121805130240 is an abundant number, since it is smaller than the sum of its proper divisors (320143833216).

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

121805130240 is an equidigital number, since it uses as much as digits as its factorization.

121805130240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2042 (or 2014 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

Adding to 121805130240 its reverse (42031508121), we get a palindrome (163836638361).

The spelling of 121805130240 in words is "one hundred twenty-one billion, eight hundred five million, one hundred thirty thousand, two hundred forty".