21130356113 has 2 divisors, whose sum is σ = 21130356114. Its totient is φ = 21130356112.

The previous prime is 21130356089. The next prime is 21130356161. The reversal of 21130356113 is 31165303112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17670916624 + 3459439489 = 132932^2 + 58817^2 .

It is a cyclic number.

It is not a de Polignac number, because 21130356113 - 2¹² = 21130352017 is a prime.

It is not a weakly prime, because it can be changed into another prime (21130356413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10565178056 + 10565178057.

It is an arithmetic number, because the mean of its divisors is an integer number (10565178057).

Almost surely, 2^21130356113 is an apocalyptic number.

It is an amenable number.

21130356113 is a deficient number, since it is larger than the sum of its proper divisors (1).

21130356113 is an equidigital number, since it uses as much as digits as its factorization.

21130356113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 26.

Adding to 21130356113 its reverse (31165303112), we get a palindrome (52295659225).

The spelling of 21130356113 in words is "twenty-one billion, one hundred thirty million, three hundred fifty-six thousand, one hundred thirteen".