2011221101 has 4 divisors (see below), whose sum is σ = 2011314012.
Its totient is φ = 2011128192.
The previous prime is 2011221073. The next prime is 2011221119. The reversal of 2011221101 is 1011221102.
Adding to 2011221101 its reverse (1011221102), we get a palindrome (3022442203).
Subtracting from 2011221101 its reverse (1011221102), we obtain a palindrome (999999999).
It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.
It can be written as a sum of positive squares in 2 ways, for example, as 1654048900 + 357172201 = 40670^2 + 18899^2
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-2011221101 is a prime.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (2011224101) 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, 5051 + ... + 63623.
It is an arithmetic number, because the mean of its divisors is an integer number (502828503).
Almost surely, 22011221101 is an apocalyptic number.
It is an amenable number.
2011221101 is a deficient number, since it is larger than the sum of its proper divisors (92911).
2011221101 is an equidigital number, since it uses as much as digits as its factorization.
2011221101 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 92910.
The product of its (nonzero) digits is 8, while the sum is 11.
The square root of 2011221101 is about 44846.6397960873.
The cubic root of 2011221101 is about 1262.2729404554.
The spelling of 2011221101 in words is "two billion, eleven million, two hundred twenty-one thousand, one hundred one".