11211210221011 has 4 divisors (see below), whose sum is σ = 11241758478112. Its totient is φ = 11180661963912.

The previous prime is 11211210220997. The next prime is 11211210221051. The reversal of 11211210221011 is 11012201211211.

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-11211210221011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11211210221051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15274128000 + ... + 15274128733.

It is an arithmetic number, because the mean of its divisors is an integer number (2810439619528).

Almost surely, 2^{11211210221011} is an apocalyptic number.

11211210221011 is a deficient number, since it is larger than the sum of its proper divisors (30548257101).

11211210221011 is an equidigital number, since it uses as much as digits as its factorization.

11211210221011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30548257100.

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

Adding to 11211210221011 its reverse (11012201211211), we get a palindrome (22223411432222).

The spelling of 11211210221011 in words is "eleven trillion, two hundred eleven billion, two hundred ten million, two hundred twenty-one thousand, eleven".