121531405512 has 64 divisors (see below), whose sum is σ = 331623927360. Its totient is φ = 36808294400.

The previous prime is 121531405409. The next prime is 121531405559. The reversal of 121531405512 is 215504135121.

It is a self number, because there is not a number n which added to its sum of digits gives 121531405512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 384712 + ... + 625352.

It is an arithmetic number, because the mean of its divisors is an integer number (5181623865).

Almost surely, 2^121531405512 is an apocalyptic number.

121531405512 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121531405512 is an abundant number, since it is smaller than the sum of its proper divisors (210092521848).

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

121531405512 is a wasteful number, since it uses less digits than its factorization.

121531405512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242574 (or 242570 counting only the distinct ones).

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

The spelling of 121531405512 in words is "one hundred twenty-one billion, five hundred thirty-one million, four hundred five thousand, five hundred twelve".