1216243211 has 2 divisors, whose sum is σ = 1216243212. Its totient is φ = 1216243210.

The previous prime is 1216243201. The next prime is 1216243253. The reversal of 1216243211 is 1123426121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1216243211 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1216243201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608121605 + 608121606.

It is an arithmetic number, because the mean of its divisors is an integer number (608121606).

Almost surely, 2^1216243211 is an apocalyptic number.

1216243211 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216243211 is an equidigital number, since it uses as much as digits as its factorization.

1216243211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 23.

The square root of 1216243211 is about 34874.6786508492. The cubic root of 1216243211 is about 1067.4318153408.

Adding to 1216243211 its reverse (1123426121), we get a palindrome (2339669332).

The spelling of 1216243211 in words is "one billion, two hundred sixteen million, two hundred forty-three thousand, two hundred eleven".