11220012111 has 24 divisors (see below), whose sum is σ = 18984513024. Its totient is φ = 5828576880.

The previous prime is 11220012049. The next prime is 11220012131. The reversal of 11220012111 is 11121002211.

It is not a de Polignac number, because 11220012111 - 2⁶ = 11220012047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11220012131) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3467775 + ... + 3471008.

It is an arithmetic number, because the mean of its divisors is an integer number (791021376).

Almost surely, 2^11220012111 is an apocalyptic number.

11220012111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11220012111 is a deficient number, since it is larger than the sum of its proper divisors (7764500913).

11220012111 is a wasteful number, since it uses less digits than its factorization.

11220012111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6938811 (or 6938804 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 11220012111 its reverse (11121002211), we get a palindrome (22341014322).

The spelling of 11220012111 in words is "eleven billion, two hundred twenty million, twelve thousand, one hundred eleven".