12030021 has 12 divisors (see below), whose sum is σ = 18291520. Its totient is φ = 7597800.

The previous prime is 12030017. The next prime is 12030043. The reversal of 12030021 is 12003021.

It is a happy number.

12030021 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12030021 - 2² = 12030017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12029985 and 12030012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12030061) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 35005 + ... + 35346.

Almost surely, 2^12030021 is an apocalyptic number.

It is an amenable number.

12030021 is a deficient number, since it is larger than the sum of its proper divisors (6261499).

12030021 is a wasteful number, since it uses less digits than its factorization.

12030021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70376 (or 70373 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 12030021 is about 3468.4320665107. The cubic root of 12030021 is about 229.1336087779.

Adding to 12030021 its reverse (12003021), we get a palindrome (24033042).

Subtracting from 12030021 its reverse (12003021), we obtain a cube (27000 = 30³).

The spelling of 12030021 in words is "twelve million, thirty thousand, twenty-one".