21171136011313 has 4 divisors (see below), whose sum is σ = 21171148511040. Its totient is φ = 21171123511588.

The previous prime is 21171136011293. The next prime is 21171136011329. The reversal of 21171136011313 is 31311063117112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21171136011313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21171136015313) 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, 3219493 + ... + 7259986.

It is an arithmetic number, because the mean of its divisors is an integer number (5292787127760).

Almost surely, 2^{21171136011313} is an apocalyptic number.

It is an amenable number.

21171136011313 is a deficient number, since it is larger than the sum of its proper divisors (12499727).

21171136011313 is a wasteful number, since it uses less digits than its factorization.

21171136011313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12499726.

The product of its (nonzero) digits is 2268, while the sum is 31.

Adding to 21171136011313 its reverse (31311063117112), we get a palindrome (52482199128425).

The spelling of 21171136011313 in words is "twenty-one trillion, one hundred seventy-one billion, one hundred thirty-six million, eleven thousand, three hundred thirteen".