11221011 has 24 divisors (see below), whose sum is σ = 17106544. Its totient is φ = 7348320.

The previous prime is 11221009. The next prime is 11221043. The reversal of 11221011 is 11012211.

It is a happy number.

It is not a de Polignac number, because 11221011 - 2¹ = 11221009 is a prime.

It is a super-2 number, since 2×11221011² = 251822175724242, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11220984 and 11221002.

It is not an unprimeable number, because it can be changed into a prime (11221051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14445 + ... + 15201.

Almost surely, 2^11221011 is an apocalyptic number.

11221011 is a deficient number, since it is larger than the sum of its proper divisors (5885533).

11221011 is an frugal number, since it uses more digits than its factorization.

11221011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 833 (or 821 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 11221011 is about 3349.7777538219. Note that the first 4 decimals coincide. The cubic root of 11221011 is about 223.8776103834.

Adding to 11221011 its reverse (11012211), we get a palindrome (22233222).

The spelling of 11221011 in words is "eleven million, two hundred twenty-one thousand, eleven".