1243410221 has 2 divisors, whose sum is σ = 1243410222. Its totient is φ = 1243410220.

The previous prime is 1243410193. The next prime is 1243410227. The reversal of 1243410221 is 1220143421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1236577225 + 6832996 = 35165^2 + 2614^2 .

It is a cyclic number.

It is not a de Polignac number, because 1243410221 - 2¹⁰ = 1243409197 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 = 1243410193 and 1243410202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1243410227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621705110 + 621705111.

It is an arithmetic number, because the mean of its divisors is an integer number (621705111).

Almost surely, 2^1243410221 is an apocalyptic number.

It is an amenable number.

1243410221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243410221 is an equidigital number, since it uses as much as digits as its factorization.

1243410221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1243410221 is about 35262.0223611749. The cubic root of 1243410221 is about 1075.3210423139.

Adding to 1243410221 its reverse (1220143421), we get a palindrome (2463553642).

The spelling of 1243410221 in words is "one billion, two hundred forty-three million, four hundred ten thousand, two hundred twenty-one".