12230021 has 4 divisors (see below), whose sum is σ = 12949452. Its totient is φ = 11510592.

The previous prime is 12230003. The next prime is 12230041. The reversal of 12230021 is 12003221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3556996 + 8673025 = 1886^2 + 2945^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12230021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12229984 and 12230011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12230041) 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 3 ways as a sum of consecutive naturals, for example, 359690 + ... + 359723.

It is an arithmetic number, because the mean of its divisors is an integer number (3237363).

Almost surely, 2^12230021 is an apocalyptic number.

It is an amenable number.

12230021 is a deficient number, since it is larger than the sum of its proper divisors (719431).

12230021 is an equidigital number, since it uses as much as digits as its factorization.

12230021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 719430.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 12230021 is about 3497.1446924598. The cubic root of 12230021 is about 230.3964240881.

Adding to 12230021 its reverse (12003221), we get a palindrome (24233242).

The spelling of 12230021 in words is "twelve million, two hundred thirty thousand, twenty-one".