21130113131 has 2 divisors, whose sum is σ = 21130113132. Its totient is φ = 21130113130.

The previous prime is 21130113107. The next prime is 21130113163. The reversal of 21130113131 is 13131103112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21130113131 is a prime.

It is a super-2 number, since 2×21130113131² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21130113931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10565056565 + 10565056566.

It is an arithmetic number, because the mean of its divisors is an integer number (10565056566).

Almost surely, 2^21130113131 is an apocalyptic number.

21130113131 is a deficient number, since it is larger than the sum of its proper divisors (1).

21130113131 is an equidigital number, since it uses as much as digits as its factorization.

21130113131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54, while the sum is 17.

Adding to 21130113131 its reverse (13131103112), we get a palindrome (34261216243).

The spelling of 21130113131 in words is "twenty-one billion, one hundred thirty million, one hundred thirteen thousand, one hundred thirty-one".