12030721 has 4 divisors (see below), whose sum is σ = 12210352. Its totient is φ = 11851092.

The previous prime is 12030719. The next prime is 12030727. The reversal of 12030721 is 12703021.

It is a happy number.

12030721 is digitally balanced in base 3, because in such base 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 Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12703021 = 283 ⋅44887.

It is a cyclic number.

It is not a de Polignac number, because 12030721 - 2¹ = 12030719 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12030695 and 12030704.

It is not an unprimeable number, because it can be changed into a prime (12030727) 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 3 ways as a sum of consecutive naturals, for example, 89715 + ... + 89848.

It is an arithmetic number, because the mean of its divisors is an integer number (3052588).

Almost surely, 2^12030721 is an apocalyptic number.

It is an amenable number.

12030721 is a deficient number, since it is larger than the sum of its proper divisors (179631).

12030721 is an equidigital number, since it uses as much as digits as its factorization.

12030721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179630.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 12030721 is about 3468.5329751928. The cubic root of 12030721 is about 229.1380529490.

Adding to 12030721 its reverse (12703021), we get a palindrome (24733742).

The spelling of 12030721 in words is "twelve million, thirty thousand, seven hundred twenty-one".