13111102021 has 4 divisors (see below), whose sum is σ = 13122020044. Its totient is φ = 13100184000.

The previous prime is 13111102009. The next prime is 13111102051. The reversal of 13111102021 is 12020111131.

It is a happy number.

13111102021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5456776900 + 7654325121 = 73870^2 + 87489^2 .

It is a cyclic number.

It is not a de Polignac number, because 13111102021 - 2⁵ = 13111101989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13111101992 and 13111102010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13111102051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5457210 + ... + 5459611.

It is an arithmetic number, because the mean of its divisors is an integer number (3280505011).

Almost surely, 2^13111102021 is an apocalyptic number.

It is an amenable number.

13111102021 is a deficient number, since it is larger than the sum of its proper divisors (10918023).

13111102021 is a wasteful number, since it uses less digits than its factorization.

13111102021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10918022.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 13111102021 its reverse (12020111131), we get a palindrome (25131213152).

It can be divided in two parts, 1311110 and 2021, that added together give a palindrome (1313131).

The spelling of 13111102021 in words is "thirteen billion, one hundred eleven million, one hundred two thousand, twenty-one".