11021011221 has 32 divisors (see below), whose sum is σ = 16560414720. Its totient is φ = 6458961600.

The previous prime is 11021011213. The next prime is 11021011279. The reversal of 11021011221 is 12211012011.

It is not a de Polignac number, because 11021011221 - 2³ = 11021011213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11021011197 and 11021011206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11021011621) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1646760 + ... + 1653438.

It is an arithmetic number, because the mean of its divisors is an integer number (517512960).

Almost surely, 2^11021011221 is an apocalyptic number.

11021011221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11021011221 is a deficient number, since it is larger than the sum of its proper divisors (5539403499).

11021011221 is a wasteful number, since it uses less digits than its factorization.

11021011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8337.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 11021011221 its reverse (12211012011), we get a palindrome (23232023232).

The spelling of 11021011221 in words is "eleven billion, twenty-one million, eleven thousand, two hundred twenty-one".