121515315240 has 128 divisors (see below), whose sum is σ = 421079886720. Its totient is φ = 27725414400.

The previous prime is 121515315227. The next prime is 121515315263. The reversal of 121515315240 is 42513515121.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 121515315198 and 121515315207.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2685121 + ... + 2730000.

It is an arithmetic number, because the mean of its divisors is an integer number (3289686615).

Almost surely, 2^121515315240 is an apocalyptic number.

121515315240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121515315240 is an abundant number, since it is smaller than the sum of its proper divisors (299564571480).

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

121515315240 is a wasteful number, since it uses less digits than its factorization.

121515315240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5415163 (or 5415159 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 30.

The spelling of 121515315240 in words is "one hundred twenty-one billion, five hundred fifteen million, three hundred fifteen thousand, two hundred forty".