121530 has 16 divisors (see below), whose sum is σ = 291744. Its totient is φ = 32400.

The previous prime is 121523. The next prime is 121531. The reversal of 121530 is 35121.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 121530.

It is not an unprimeable number, because it can be changed into a prime (121531) by changing a digit.

121530 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1996 + ... + 2055.

It is an arithmetic number, because the mean of its divisors is an integer number (18234).

2¹²¹⁵³⁰ is an apocalyptic number.

121530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121530 is an abundant number, since it is smaller than the sum of its proper divisors (170214).

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

121530 is a wasteful number, since it uses less digits than its factorization.

121530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4061.

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

The square root of 121530 is about 348.6115316509. The cubic root of 121530 is about 49.5329848513.

Adding to 121530 its reverse (35121), we get a palindrome (156651).

The spelling of 121530 in words is "one hundred twenty-one thousand, five hundred thirty".