121243055500 has 96 divisors (see below), whose sum is σ = 302729132160. Its totient is φ = 41554425600.

The previous prime is 121243055447. The next prime is 121243055503. The reversal of 121243055500 is 5550342121.

121243055500 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (121243055503) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15805666 + ... + 15813334.

It is an arithmetic number, because the mean of its divisors is an integer number (3153428460).

Almost surely, 2^121243055500 is an apocalyptic number.

121243055500 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 121243055500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (151364566080).

121243055500 is an abundant number, since it is smaller than the sum of its proper divisors (181486076660).

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

121243055500 is a wasteful number, since it uses less digits than its factorization.

121243055500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12212 (or 12200 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 28.

Adding to 121243055500 its reverse (5550342121), we get a palindrome (126793397621).

The spelling of 121243055500 in words is "one hundred twenty-one billion, two hundred forty-three million, fifty-five thousand, five hundred".