21112102313 has 4 divisors (see below), whose sum is σ = 21401309268. Its totient is φ = 20822895360.

The previous prime is 21112102217. The next prime is 21112102321. The reversal of 21112102313 is 31320121112.

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 4709665129 + 16402437184 = 68627^2 + 128072^2 .

It is a cyclic number.

It is not a de Polignac number, because 21112102313 - 2²⁰ = 21111053737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21112102291 and 21112102300.

It is not an unprimeable number, because it can be changed into a prime (21112102343) 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, 144603368 + ... + 144603513.

It is an arithmetic number, because the mean of its divisors is an integer number (5350327317).

Almost surely, 2^21112102313 is an apocalyptic number.

It is an amenable number.

21112102313 is a deficient number, since it is larger than the sum of its proper divisors (289206955).

21112102313 is an equidigital number, since it uses as much as digits as its factorization.

21112102313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289206954.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21112102313 its reverse (31320121112), we get a palindrome (52432223425).

The spelling of 21112102313 in words is "twenty-one billion, one hundred twelve million, one hundred two thousand, three hundred thirteen".