12081021 has 12 divisors (see below), whose sum is σ = 16467072. Its totient is φ = 7878328.

The previous prime is 12081011. The next prime is 12081029. The reversal of 12081021 is 12018021.

It is not a de Polignac number, because 12081021 - 2¹⁰ = 12079997 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12081029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5716 + ... + 7538.

It is an arithmetic number, because the mean of its divisors is an integer number (1372256).

Almost surely, 2^12081021 is an apocalyptic number.

It is an amenable number.

12081021 is a deficient number, since it is larger than the sum of its proper divisors (4386051).

12081021 is an equidigital number, since it uses as much as digits as its factorization.

12081021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1920 (or 1873 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

The square root of 12081021 is about 3475.7763161631. The cubic root of 12081021 is about 229.4569481758.

Adding to 12081021 its reverse (12018021), we get a palindrome (24099042).

The spelling of 12081021 in words is "twelve million, eighty-one thousand, twenty-one".