11011221212111 has 2 divisors, whose sum is σ = 11011221212112. Its totient is φ = 11011221212110.

The previous prime is 11011221212081. The next prime is 11011221212149. The reversal of 11011221212111 is 11121212211011.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11011221212111 - 2¹⁴ = 11011221195727 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11011221212111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11011221212311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5505610606055 + 5505610606056.

It is an arithmetic number, because the mean of its divisors is an integer number (5505610606056).

Almost surely, 2^{11011221212111} is an apocalyptic number.

11011221212111 is a deficient number, since it is larger than the sum of its proper divisors (1).

11011221212111 is an equidigital number, since it uses as much as digits as its factorization.

11011221212111 is an evil number, because the sum of its binary digits is even.

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

Adding to 11011221212111 its reverse (11121212211011), we get a palindrome (22132433423122).

The spelling of 11011221212111 in words is "eleven trillion, eleven billion, two hundred twenty-one million, two hundred twelve thousand, one hundred eleven".