21010113131 has 6 divisors (see below), whose sum is σ = 24440335740. Its totient is φ = 18008668356.

The previous prime is 21010113077. The next prime is 21010113211. The reversal of 21010113131 is 13131101012.

It is a happy number.

It is not a de Polignac number, because 21010113131 - 2²² = 21005918827 is a prime.

It is a super-2 number, since 2×21010113131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21010119131) 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 5 ways as a sum of consecutive naturals, for example, 214388861 + ... + 214388958.

It is an arithmetic number, because the mean of its divisors is an integer number (4073389290).

Almost surely, 2^21010113131 is an apocalyptic number.

21010113131 is a deficient number, since it is larger than the sum of its proper divisors (3430222609).

21010113131 is an equidigital number, since it uses as much as digits as its factorization.

21010113131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428777833 (or 428777826 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 14.

Adding to 21010113131 its reverse (13131101012), we get a palindrome (34141214143).

The spelling of 21010113131 in words is "twenty-one billion, ten million, one hundred thirteen thousand, one hundred thirty-one".