11001221011211 has 4 divisors (see below), whose sum is σ = 11580232643400. Its totient is φ = 10422209379024.

The previous prime is 11001221011201. The next prime is 11001221011243. The reversal of 11001221011211 is 11211012210011.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11001221011211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11001221011201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 289505816066 + ... + 289505816103.

It is an arithmetic number, because the mean of its divisors is an integer number (2895058160850).

Almost surely, 2^{11001221011211} is an apocalyptic number.

11001221011211 is a deficient number, since it is larger than the sum of its proper divisors (579011632189).

11001221011211 is an equidigital number, since it uses as much as digits as its factorization.

11001221011211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 579011632188.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 11001221011211 its reverse (11211012210011), we get a palindrome (22212233221222).

The spelling of 11001221011211 in words is "eleven trillion, one billion, two hundred twenty-one million, eleven thousand, two hundred eleven".