11021220211 has 4 divisors (see below), whose sum is σ = 11052442152. Its totient is φ = 10989998272.

The previous prime is 11021220193. The next prime is 11021220239. The reversal of 11021220211 is 11202212011.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11021220211 - 2¹⁹ = 11020695923 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11021220191 and 11021220200.

It is not an unprimeable number, because it can be changed into a prime (11021220281) 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, 15610441 + ... + 15611146.

It is an arithmetic number, because the mean of its divisors is an integer number (2763110538).

Almost surely, 2^11021220211 is an apocalyptic number.

11021220211 is a deficient number, since it is larger than the sum of its proper divisors (31221941).

11021220211 is an equidigital number, since it uses as much as digits as its factorization.

11021220211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31221940.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 11021220211 its reverse (11202212011), we get a palindrome (22223432222).

The spelling of 11021220211 in words is "eleven billion, twenty-one million, two hundred twenty thousand, two hundred eleven".