11111021220211 has 12 divisors (see below), whose sum is σ = 12384497279160. Its totient is φ = 9886014990560.

The previous prime is 11111021220209. The next prime is 11111021220223. The reversal of 11111021220211 is 11202212011111.

It is not a de Polignac number, because 11111021220211 - 2¹ = 11111021220209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11111021220281) 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 11 ways as a sum of consecutive naturals, for example, 228606946 + ... + 228655543.

It is an arithmetic number, because the mean of its divisors is an integer number (1032041439930).

Almost surely, 2^{11111021220211} is an apocalyptic number.

11111021220211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11111021220211 is a deficient number, since it is larger than the sum of its proper divisors (1273476058949).

11111021220211 is an equidigital number, since it uses as much as digits as its factorization.

11111021220211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457262594 (or 457262547 counting only the distinct ones).

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

Adding to 11111021220211 its reverse (11202212011111), we get a palindrome (22313233231322).

The spelling of 11111021220211 in words is "eleven trillion, one hundred eleven billion, twenty-one million, two hundred twenty thousand, two hundred eleven".