11220021011 has 4 divisors (see below), whose sum is σ = 11220478224. Its totient is φ = 11219563800.

The previous prime is 11220020993. The next prime is 11220021013. The reversal of 11220021011 is 11012002211.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11220021011 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11220020983 and 11220021001.

It is not an unprimeable number, because it can be changed into a prime (11220021013) 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 3 ways as a sum of consecutive naturals, for example, 189575 + ... + 241616.

It is an arithmetic number, because the mean of its divisors is an integer number (2805119556).

Almost surely, 2^11220021011 is an apocalyptic number.

11220021011 is a deficient number, since it is larger than the sum of its proper divisors (457213).

11220021011 is an equidigital number, since it uses as much as digits as its factorization.

11220021011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457212.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 11220021011 its reverse (11012002211), we get a palindrome (22232023222).

The spelling of 11220021011 in words is "eleven billion, two hundred twenty million, twenty-one thousand, eleven".