11011212211211 has 2 divisors, whose sum is σ = 11011212211212. Its totient is φ = 11011212211210.

The previous prime is 11011212211201. The next prime is 11011212211231. The reversal of 11011212211211 is 11211221211011.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11011212211211 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11011212211211.

It is not a weakly prime, because it can be changed into another prime (11011212211201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5505606105605 + 5505606105606.

It is an arithmetic number, because the mean of its divisors is an integer number (5505606105606).

Almost surely, 2^{11011212211211} is an apocalyptic number.

11011212211211 is a deficient number, since it is larger than the sum of its proper divisors (1).

11011212211211 is an equidigital number, since it uses as much as digits as its factorization.

11011212211211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 11011212211211 its reverse (11211221211011), we get a palindrome (22222433422222).

The spelling of 11011212211211 in words is "eleven trillion, eleven billion, two hundred twelve million, two hundred eleven thousand, two hundred eleven".