11123021111 has 4 divisors (see below), whose sum is σ = 11172021432. Its totient is φ = 11074020792.

The previous prime is 11123021093. The next prime is 11123021113. The reversal of 11123021111 is 11112032111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11112032111 = 9059 ⋅1226629.

It is a cyclic number.

It is not a de Polignac number, because 11123021111 - 2⁶ = 11123021047 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 (11123021113) 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, 24499820 + ... + 24500273.

It is an arithmetic number, because the mean of its divisors is an integer number (2793005358).

Almost surely, 2^11123021111 is an apocalyptic number.

11123021111 is a deficient number, since it is larger than the sum of its proper divisors (49000321).

11123021111 is an equidigital number, since it uses as much as digits as its factorization.

11123021111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49000320.

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 11123021111 its reverse (11112032111), we get a palindrome (22235053222).

The spelling of 11123021111 in words is "eleven billion, one hundred twenty-three million, twenty-one thousand, one hundred eleven".