121500000 has 252 divisors, whose sum is σ = 447884892. Its totient is φ = 32400000.

The previous prime is 121499993. The next prime is 121500019. The reversal of 121500000 is 5121.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is an ABA number since it can be written as A⋅B^A, here for A=5, B=30.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a nialpdrome in base 15.

It is a zygodrome in base 15.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 41 ways as a sum of consecutive naturals, for example, 24299998 + ... + 24300002.

It is an arithmetic number, because the mean of its divisors is an integer number (1777321).

Almost surely, 2^121500000 is an apocalyptic number.

121500000 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 121500000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (223942446).

121500000 is an abundant number, since it is smaller than the sum of its proper divisors (326384892).

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

121500000 is an frugal number, since it uses more digits than its factorization.

121500000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55 (or 10 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 9.

The square root of 121500000 is about 11022.7038425243. The cubic root of 121500000 is about 495.2890873342.

Adding to 121500000 its reverse (5121), we get a palindrome (121505121).

The spelling of 121500000 in words is "one hundred twenty-one million, five hundred thousand".