1321236011 has 2 divisors, whose sum is σ = 1321236012. Its totient is φ = 1321236010.

The previous prime is 1321235983. The next prime is 1321236067. The reversal of 1321236011 is 1106321231.

It is a weak prime.

It is an emirp because it is prime and its reverse (1106321231) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1321236011 is a prime.

It is not a weakly prime, because it can be changed into another prime (1321235011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660618005 + 660618006.

It is an arithmetic number, because the mean of its divisors is an integer number (660618006).

Almost surely, 2^1321236011 is an apocalyptic number.

1321236011 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321236011 is an equidigital number, since it uses as much as digits as its factorization.

1321236011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 1321236011 is about 36348.8103106553. The cubic root of 1321236011 is about 1097.3035916156.

Adding to 1321236011 its reverse (1106321231), we get a palindrome (2427557242).

The spelling of 1321236011 in words is "one billion, three hundred twenty-one million, two hundred thirty-six thousand, eleven".