121530000 has 100 divisors (see below), whose sum is σ = 392411888. Its totient is φ = 32400000.

The previous prime is 121529987. The next prime is 121530041. The reversal of 121530000 is 35121.

It is a tau number, because it is divible by the number of its divisors (100).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 27975 + ... + 32025.

Almost surely, 2^121530000 is an apocalyptic number.

121530000 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 121530000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (196205944).

121530000 is an abundant number, since it is smaller than the sum of its proper divisors (270881888).

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

121530000 is an equidigital number, since it uses as much as digits as its factorization.

121530000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4082 (or 4061 counting only the distinct ones).

The product of its (nonzero) digits is 30, while the sum is 12.

The square root of 121530000 is about 11024.0645861678. The cubic root of 121530000 is about 495.3298485135.

Adding to 121530000 its reverse (35121), we get a palindrome (121565121).

The spelling of 121530000 in words is "one hundred twenty-one million, five hundred thirty thousand".