12224021 has 2 divisors, whose sum is σ = 12224022. Its totient is φ = 12224020.

The previous prime is 12223987. The next prime is 12224029. The reversal of 12224021 is 12042221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10562500 + 1661521 = 3250^2 + 1289^2 .

It is a cyclic number.

It is not a de Polignac number, because 12224021 - 2²² = 8029717 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12223987 and 12224005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12224029) 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 as a sum of consecutive naturals, namely, 6112010 + 6112011.

It is an arithmetic number, because the mean of its divisors is an integer number (6112011).

Almost surely, 2^12224021 is an apocalyptic number.

It is an amenable number.

12224021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12224021 is an equidigital number, since it uses as much as digits as its factorization.

12224021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 12224021 is about 3496.2867445334. The cubic root of 12224021 is about 230.3587407331.

Adding to 12224021 its reverse (12042221), we get a palindrome (24266242).

The spelling of 12224021 in words is "twelve million, two hundred twenty-four thousand, twenty-one".