11001220111211 has 16 divisors (see below), whose sum is σ = 12170266416000. Its totient is φ = 9860812662720.

The previous prime is 11001220111177. The next prime is 11001220111279. The reversal of 11001220111211 is 11211102210011.

It is a de Polignac number, because none of the positive numbers 2^k-11001220111211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11001220110211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11618090 + ... + 12529263.

It is an arithmetic number, because the mean of its divisors is an integer number (760641651000).

Almost surely, 2^{11001220111211} is an apocalyptic number.

11001220111211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11001220111211 is a deficient number, since it is larger than the sum of its proper divisors (1169046304789).

11001220111211 is a wasteful number, since it uses less digits than its factorization.

11001220111211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24147946.

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

Adding to 11001220111211 its reverse (11211102210011), we get a palindrome (22212322321222).

The spelling of 11001220111211 in words is "eleven trillion, one billion, two hundred twenty million, one hundred eleven thousand, two hundred eleven".