121550215000 has 80 divisors (see below), whose sum is σ = 287729303400. Its totient is φ = 48118656000.

The previous prime is 121550214977. The next prime is 121550215009. The reversal of 121550215000 is 512055121.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121550215009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 359691 + ... + 610309.

Almost surely, 2^121550215000 is an apocalyptic number.

121550215000 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 121550215000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (143864651700).

121550215000 is an abundant number, since it is smaller than the sum of its proper divisors (166179088400).

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

121550215000 is an equidigital number, since it uses as much as digits as its factorization.

121550215000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250742 (or 250723 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 22.

The spelling of 121550215000 in words is "one hundred twenty-one billion, five hundred fifty million, two hundred fifteen thousand".