21100223113 has 4 divisors (see below), whose sum is σ = 21187776148. Its totient is φ = 21012670080.

The previous prime is 21100223107. The next prime is 21100223141. The reversal of 21100223113 is 31132200112.

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 5596984969 + 15503238144 = 74813^2 + 124512^2 .

It is a cyclic number.

It is not a de Polignac number, because 21100223113 - 2⁹ = 21100222601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21100223143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43776156 + ... + 43776637.

It is an arithmetic number, because the mean of its divisors is an integer number (5296944037).

Almost surely, 2^21100223113 is an apocalyptic number.

It is an amenable number.

21100223113 is a deficient number, since it is larger than the sum of its proper divisors (87553035).

21100223113 is an equidigital number, since it uses as much as digits as its factorization.

21100223113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87553034.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21100223113 its reverse (31132200112), we get a palindrome (52232423225).

The spelling of 21100223113 in words is "twenty-one billion, one hundred million, two hundred twenty-three thousand, one hundred thirteen".