21031034113 has 2 divisors, whose sum is σ = 21031034114. Its totient is φ = 21031034112.

The previous prime is 21031034093. The next prime is 21031034149. The reversal of 21031034113 is 31143013012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19206633744 + 1824400369 = 138588^2 + 42713^2 .

It is a cyclic number.

It is not a de Polignac number, because 21031034113 - 2⁵ = 21031034081 is a prime.

It is not a weakly prime, because it can be changed into another prime (21031034183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515517056 + 10515517057.

It is an arithmetic number, because the mean of its divisors is an integer number (10515517057).

Almost surely, 2^21031034113 is an apocalyptic number.

It is an amenable number.

21031034113 is a deficient number, since it is larger than the sum of its proper divisors (1).

21031034113 is an equidigital number, since it uses as much as digits as its factorization.

21031034113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21031034113 its reverse (31143013012), we get a palindrome (52174047125).

The spelling of 21031034113 in words is "twenty-one billion, thirty-one million, thirty-four thousand, one hundred thirteen".