21112011113 has 12 divisors (see below), whose sum is σ = 21594988548. Its totient is φ = 20637770400.

The previous prime is 21112011097. The next prime is 21112011133. The reversal of 21112011113 is 31111021112.

It can be written as a sum of positive squares in 2 ways, for example, as 20854825744 + 257185369 = 144412^2 + 16037^2 .

It is not a de Polignac number, because 21112011113 - 2⁴ = 21112011097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21112011133) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 613595 + ... + 647087.

It is an arithmetic number, because the mean of its divisors is an integer number (1799582379).

Almost surely, 2^21112011113 is an apocalyptic number.

It is an amenable number.

21112011113 is a deficient number, since it is larger than the sum of its proper divisors (482977435).

21112011113 is an equidigital number, since it uses as much as digits as its factorization.

21112011113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33752 (or 33673 counting only the distinct ones).

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

Adding to 21112011113 its reverse (31111021112), we get a palindrome (52223032225).

Subtracting 21112011113 from its reverse (31111021112), we obtain a palindrome (9999009999).

The spelling of 21112011113 in words is "twenty-one billion, one hundred twelve million, eleven thousand, one hundred thirteen".