121540000 has 120 divisors (see below), whose sum is σ = 307026720. Its totient is φ = 47328000.

The previous prime is 121539997. The next prime is 121540007. The reversal of 121540000 is 45121.

It is not an unprimeable number, because it can be changed into a prime (121540007) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1179949 + ... + 1180051.

It is an arithmetic number, because the mean of its divisors is an integer number (2558556).

Almost surely, 2^121540000 is an apocalyptic number.

121540000 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 121540000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (153513360).

121540000 is an abundant number, since it is smaller than the sum of its proper divisors (185486720).

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

121540000 is an equidigital number, since it uses as much as digits as its factorization.

121540000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192 (or 169 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 121540000 is about 11024.5181300590. The cubic root of 121540000 is about 495.3434340826.

Adding to 121540000 its reverse (45121), we get a palindrome (121585121).

The spelling of 121540000 in words is "one hundred twenty-one million, five hundred forty thousand".