21131013113 has 16 divisors (see below), whose sum is σ = 24497381376. Its totient is φ = 17851715280.

The previous prime is 21131013097. The next prime is 21131013161. The reversal of 21131013113 is 31131013112.

It is not a de Polignac number, because 21131013113 - 2⁴ = 21131013097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21131013091 and 21131013100.

It is not an unprimeable number, because it can be changed into a prime (21131013193) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3149120 + ... + 3155822.

It is an arithmetic number, because the mean of its divisors is an integer number (1531086336).

Almost surely, 2^21131013113 is an apocalyptic number.

It is an amenable number.

21131013113 is a deficient number, since it is larger than the sum of its proper divisors (3366368263).

21131013113 is an equidigital number, since it uses as much as digits as its factorization.

21131013113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13124.

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

Adding to 21131013113 its reverse (31131013112), we get a palindrome (52262026225).

Subtracting 21131013113 from its reverse (31131013112), we obtain a palindrome (9999999999).

The spelling of 21131013113 in words is "twenty-one billion, one hundred thirty-one million, thirteen thousand, one hundred thirteen".