1244340221 has 2 divisors, whose sum is σ = 1244340222. Its totient is φ = 1244340220.

The previous prime is 1244340199. The next prime is 1244340241. The reversal of 1244340221 is 1220434421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 988788025 + 255552196 = 31445^2 + 15986^2 .

It is an emirp because it is prime and its reverse (1220434421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1244340221 - 2²⁶ = 1177231357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1244340241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622170110 + 622170111.

It is an arithmetic number, because the mean of its divisors is an integer number (622170111).

Almost surely, 2^1244340221 is an apocalyptic number.

It is an amenable number.

1244340221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1244340221 is an equidigital number, since it uses as much as digits as its factorization.

1244340221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 1244340221 is about 35275.2068881247. The cubic root of 1244340221 is about 1075.5890684594.

Adding to 1244340221 its reverse (1220434421), we get a palindrome (2464774642).

The spelling of 1244340221 in words is "one billion, two hundred forty-four million, three hundred forty thousand, two hundred twenty-one".