21130242113 has 2 divisors, whose sum is σ = 21130242114. Its totient is φ = 21130242112.

The previous prime is 21130242013. The next prime is 21130242121. The reversal of 21130242113 is 31124203112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11919617329 + 9210624784 = 109177^2 + 95972^2 .

It is a cyclic number.

It is not a de Polignac number, because 21130242113 - 2⁸ = 21130241857 is a prime.

It is not a weakly prime, because it can be changed into another prime (21130242013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10565121056 + 10565121057.

It is an arithmetic number, because the mean of its divisors is an integer number (10565121057).

Almost surely, 2^21130242113 is an apocalyptic number.

It is an amenable number.

21130242113 is a deficient number, since it is larger than the sum of its proper divisors (1).

21130242113 is an equidigital number, since it uses as much as digits as its factorization.

21130242113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21130242113 its reverse (31124203112), we get a palindrome (52254445225).

The spelling of 21130242113 in words is "twenty-one billion, one hundred thirty million, two hundred forty-two thousand, one hundred thirteen".