11011011221 has 4 divisors (see below), whose sum is σ = 12584012832. Its totient is φ = 9438009612.

The previous prime is 11011011173. The next prime is 11011011227. The reversal of 11011011221 is 12211011011.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11011011221 - 2¹⁸ = 11010749077 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 (11011011227) 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, 786500795 + ... + 786500808.

It is an arithmetic number, because the mean of its divisors is an integer number (3146003208).

Almost surely, 2^11011011221 is an apocalyptic number.

It is an amenable number.

11011011221 is a deficient number, since it is larger than the sum of its proper divisors (1573001611).

11011011221 is an equidigital number, since it uses as much as digits as its factorization.

11011011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1573001610.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 11011011221 its reverse (12211011011), we get a palindrome (23222022232).

The spelling of 11011011221 in words is "eleven billion, eleven million, eleven thousand, two hundred twenty-one".