11011112221 has 4 divisors (see below), whose sum is σ = 11027234592. Its totient is φ = 10994989852.

The previous prime is 11011112219. The next prime is 11011112227. The reversal of 11011112221 is 12221111011.

It is a happy number.

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 11011112221 - 2¹ = 11011112219 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 (11011112227) 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, 8060161 + ... + 8061526.

It is an arithmetic number, because the mean of its divisors is an integer number (2756808648).

Almost surely, 2^11011112221 is an apocalyptic number.

It is an amenable number.

11011112221 is a deficient number, since it is larger than the sum of its proper divisors (16122371).

11011112221 is an equidigital number, since it uses as much as digits as its factorization.

11011112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16122370.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 11011112221 its reverse (12221111011), we get a palindrome (23232223232).

The spelling of 11011112221 in words is "eleven billion, eleven million, one hundred twelve thousand, two hundred twenty-one".