21010110113 has 2 divisors, whose sum is σ = 21010110114. Its totient is φ = 21010110112.

The previous prime is 21010110109. The next prime is 21010110133. The reversal of 21010110113 is 31101101012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14885952064 + 6124158049 = 122008^2 + 78257^2 .

It is a cyclic number.

It is not a de Polignac number, because 21010110113 - 2² = 21010110109 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21010110094 and 21010110103.

It is not a weakly prime, because it can be changed into another prime (21010110133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505055056 + 10505055057.

It is an arithmetic number, because the mean of its divisors is an integer number (10505055057).

Almost surely, 2^21010110113 is an apocalyptic number.

It is an amenable number.

21010110113 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010110113 is an equidigital number, since it uses as much as digits as its factorization.

21010110113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6, while the sum is 11.

Adding to 21010110113 its reverse (31101101012), we get a palindrome (52111211125).

The spelling of 21010110113 in words is "twenty-one billion, ten million, one hundred ten thousand, one hundred thirteen".