11122021111 has 4 divisors (see below), whose sum is σ = 11124471672. Its totient is φ = 11119570552.

The previous prime is 11122021093. The next prime is 11122021117. The reversal of 11122021111 is 11112022111.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11122021111 - 2¹¹ = 11122019063 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11122021091 and 11122021100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11122021117) 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, 1218460 + ... + 1227553.

It is an arithmetic number, because the mean of its divisors is an integer number (2781117918).

Almost surely, 2^11122021111 is an apocalyptic number.

11122021111 is a deficient number, since it is larger than the sum of its proper divisors (2450561).

11122021111 is an equidigital number, since it uses as much as digits as its factorization.

11122021111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2450560.

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

Adding to 11122021111 its reverse (11112022111), we get a palindrome (22234043222).

The spelling of 11122021111 in words is "eleven billion, one hundred twenty-two million, twenty-one thousand, one hundred eleven".