12080021 has 4 divisors (see below), whose sum is σ = 12087852. Its totient is φ = 12072192.

The previous prime is 12080017. The next prime is 12080023. The reversal of 12080021 is 12008021.

12080021 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12008021 = 311 ⋅38611.

It can be written as a sum of positive squares in 2 ways, for example, as 2283121 + 9796900 = 1511^2 + 3130^2 .

It is a cyclic number.

It is not a de Polignac number, because 12080021 - 2² = 12080017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12079978 and 12080005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12080023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 746 + ... + 4971.

It is an arithmetic number, because the mean of its divisors is an integer number (3021963).

Almost surely, 2^12080021 is an apocalyptic number.

It is an amenable number.

12080021 is a deficient number, since it is larger than the sum of its proper divisors (7831).

12080021 is an equidigital number, since it uses as much as digits as its factorization.

12080021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7830.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 12080021 is about 3475.6324604308. The cubic root of 12080021 is about 229.4506169427.

Adding to 12080021 its reverse (12008021), we get a palindrome (24088042).

The spelling of 12080021 in words is "twelve million, eighty thousand, twenty-one".