11021221211 has 16 divisors (see below), whose sum is σ = 14797724928. Its totient is φ = 7927351200.

The previous prime is 11021221207. The next prime is 11021221217. The reversal of 11021221211 is 11212212011.

It is a cyclic number.

It is not a de Polignac number, because 11021221211 - 2² = 11021221207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11021221217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5504105 + ... + 5506106.

It is an arithmetic number, because the mean of its divisors is an integer number (924857808).

Almost surely, 2^11021221211 is an apocalyptic number.

11021221211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11021221211 is a deficient number, since it is larger than the sum of its proper divisors (3776503717).

11021221211 is a wasteful number, since it uses less digits than its factorization.

11021221211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11010242.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 11021221211 its reverse (11212212011), we get a palindrome (22233433222).

It can be divided in two parts, 11021 and 221211, that added together give a palindrome (232232).

The spelling of 11021221211 in words is "eleven billion, twenty-one million, two hundred twenty-one thousand, two hundred eleven".