12135021 has 8 divisors (see below), whose sum is σ = 16738080. Its totient is φ = 7810992.

The previous prime is 12135017. The next prime is 12135023. The reversal of 12135021 is 12053121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12135021 - 2² = 12135017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12135023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69655 + ... + 69828.

It is an arithmetic number, because the mean of its divisors is an integer number (2092260).

Almost surely, 2^12135021 is an apocalyptic number.

It is an amenable number.

12135021 is a deficient number, since it is larger than the sum of its proper divisors (4603059).

12135021 is a wasteful number, since it uses less digits than its factorization.

12135021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139515.

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

The square root of 12135021 is about 3483.5357038503. The cubic root of 12135021 is about 229.7983172136.

Adding to 12135021 its reverse (12053121), we get a palindrome (24188142).

The spelling of 12135021 in words is "twelve million, one hundred thirty-five thousand, twenty-one".