21112241 has 2 divisors, whose sum is σ = 21112242. Its totient is φ = 21112240.

The previous prime is 21112207. The next prime is 21112279. The reversal of 21112241 is 14221112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20295025 + 817216 = 4505^2 + 904^2 .

It is a cyclic number.

It is not a de Polignac number, because 21112241 - 2⁶ = 21112177 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21112291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556120 + 10556121.

It is an arithmetic number, because the mean of its divisors is an integer number (10556121).

Almost surely, 2^21112241 is an apocalyptic number.

It is an amenable number.

21112241 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112241 is an equidigital number, since it uses as much as digits as its factorization.

21112241 is an evil number, because the sum of its binary digits is even.

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

The square root of 21112241 is about 4594.8058718514. The cubic root of 21112241 is about 276.3830753234.

Adding to 21112241 its reverse (14221112), we get a palindrome (35333353).

The spelling of 21112241 in words is "twenty-one million, one hundred twelve thousand, two hundred forty-one".