121355100240 has 160 divisors (see below), whose sum is σ = 413156592000. Its totient is φ = 29221877760.

The previous prime is 121355100239. The next prime is 121355100259. The reversal of 121355100240 is 42001553121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 121355100240.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 239106 + ... + 547614.

It is an arithmetic number, because the mean of its divisors is an integer number (2582228700).

Almost surely, 2^121355100240 is an apocalyptic number.

121355100240 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 121355100240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (206578296000).

121355100240 is an abundant number, since it is smaller than the sum of its proper divisors (291801491760).

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

121355100240 is a wasteful number, since it uses less digits than its factorization.

121355100240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308685 (or 308679 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

Adding to 121355100240 its reverse (42001553121), we get a palindrome (163356653361).

The spelling of 121355100240 in words is "one hundred twenty-one billion, three hundred fifty-five million, one hundred thousand, two hundred forty".