12121530 has 16 divisors (see below), whose sum is σ = 29091744. Its totient is φ = 3232400.

The previous prime is 12121517. The next prime is 12121531. The reversal of 12121530 is 3512121.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (12121531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 201996 + ... + 202055.

It is an arithmetic number, because the mean of its divisors is an integer number (1818234).

Almost surely, 2^12121530 is an apocalyptic number.

12121530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12121530 is an abundant number, since it is smaller than the sum of its proper divisors (16970214).

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

12121530 is a wasteful number, since it uses less digits than its factorization.

12121530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404061.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 12121530 is about 3481.5987706799. The cubic root of 12121530 is about 229.7131269014.

Adding to 12121530 its reverse (3512121), we get a palindrome (15633651).

The spelling of 12121530 in words is "twelve million, one hundred twenty-one thousand, five hundred thirty".