21306153116113 has 4 divisors (see below), whose sum is σ = 21343078858660. Its totient is φ = 21269227373568.

The previous prime is 21306153116093. The next prime is 21306153116147. The reversal of 21306153116113 is 31161135160312.

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 16034642731584 + 5271510384529 = 4004328^2 + 2295977^2 .

It is a cyclic number.

It is not a de Polignac number, because 21306153116113 - 2²⁹ = 21305616245201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21306153126113) 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, 18462870408 + ... + 18462871561.

It is an arithmetic number, because the mean of its divisors is an integer number (5335769714665).

Almost surely, 2^{21306153116113} is an apocalyptic number.

It is an amenable number.

21306153116113 is a deficient number, since it is larger than the sum of its proper divisors (36925742547).

21306153116113 is an equidigital number, since it uses as much as digits as its factorization.

21306153116113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36925742546.

The product of its (nonzero) digits is 9720, while the sum is 34.

Adding to 21306153116113 its reverse (31161135160312), we get a palindrome (52467288276425).

The spelling of 21306153116113 in words is "twenty-one trillion, three hundred six billion, one hundred fifty-three million, one hundred sixteen thousand, one hundred thirteen".