11121223203111 has 24 divisors (see below), whose sum is σ = 18263905576560. Its totient is φ = 5981162057472.

The previous prime is 11121223203109. The next prime is 11121223203119. The reversal of 11121223203111 is 11130232212111.

It is not a de Polignac number, because 11121223203111 - 2¹ = 11121223203109 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11121223203119) 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, 2225132196 + ... + 2225137193.

It is an arithmetic number, because the mean of its divisors is an integer number (760996065690).

Almost surely, 2^{11121223203111} is an apocalyptic number.

11121223203111 is a deficient number, since it is larger than the sum of its proper divisors (7142682373449).

11121223203111 is a wasteful number, since it uses less digits than its factorization.

11121223203111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4450269423 (or 4450269416 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 21.

Adding to 11121223203111 its reverse (11130232212111), we get a palindrome (22251455415222).

The spelling of 11121223203111 in words is "eleven trillion, one hundred twenty-one billion, two hundred twenty-three million, two hundred three thousand, one hundred eleven".