21312035113 has 4 divisors (see below), whose sum is σ = 21888036100. Its totient is φ = 20736034128.

The previous prime is 21312035111. The next prime is 21312035117. The reversal of 21312035113 is 31153021312.

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 9324412969 + 11987622144 = 96563^2 + 109488^2 .

It is a cyclic number.

It is not a de Polignac number, because 21312035113 - 2¹ = 21312035111 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21312035111) 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, 288000438 + ... + 288000511.

It is an arithmetic number, because the mean of its divisors is an integer number (5472009025).

Almost surely, 2^21312035113 is an apocalyptic number.

It is an amenable number.

21312035113 is a deficient number, since it is larger than the sum of its proper divisors (576000987).

21312035113 is an equidigital number, since it uses as much as digits as its factorization.

21312035113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576000986.

The product of its (nonzero) digits is 540, while the sum is 22.

Adding to 21312035113 its reverse (31153021312), we get a palindrome (52465056425).

The spelling of 21312035113 in words is "twenty-one billion, three hundred twelve million, thirty-five thousand, one hundred thirteen".