1211242243 has 2 divisors, whose sum is σ = 1211242244. Its totient is φ = 1211242242.

The previous prime is 1211242237. The next prime is 1211242273. The reversal of 1211242243 is 3422421121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1211242243 - 2¹⁷ = 1211111171 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211242223) 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, 605621121 + 605621122.

It is an arithmetic number, because the mean of its divisors is an integer number (605621122).

Almost surely, 2^1211242243 is an apocalyptic number.

1211242243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211242243 is an equidigital number, since it uses as much as digits as its factorization.

1211242243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 768, while the sum is 22.

The square root of 1211242243 is about 34802.9056689237. The cubic root of 1211242243 is about 1065.9667778614.

Adding to 1211242243 its reverse (3422421121), we get a palindrome (4633663364).

The spelling of 1211242243 in words is "one billion, two hundred eleven million, two hundred forty-two thousand, two hundred forty-three".