11022121111 has 4 divisors (see below), whose sum is σ = 11501343792. Its totient is φ = 10542898432.

The previous prime is 11022121087. The next prime is 11022121129. The reversal of 11022121111 is 11112122011.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11112122011 = 1531 ⋅7258081.

It is a cyclic number.

It is not a de Polignac number, because 11022121111 - 2⁵ = 11022121079 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11022121091 and 11022121100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11022121511) 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, 239611306 + ... + 239611351.

It is an arithmetic number, because the mean of its divisors is an integer number (2875335948).

Almost surely, 2^11022121111 is an apocalyptic number.

11022121111 is a deficient number, since it is larger than the sum of its proper divisors (479222681).

11022121111 is an equidigital number, since it uses as much as digits as its factorization.

11022121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479222680.

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

Adding to 11022121111 its reverse (11112122011), we get a palindrome (22134243122).

The spelling of 11022121111 in words is "eleven billion, twenty-two million, one hundred twenty-one thousand, one hundred eleven".