21010000122101 has 2 divisors, whose sum is σ = 21010000122102. Its totient is φ = 21010000122100.

The previous prime is 21010000122011. The next prime is 21010000122131. The reversal of 21010000122101 is 10122100001012.

Together with previous prime (21010000122011) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15935225691025 + 5074774431076 = 3991895^2 + 2252726^2 .

It is a cyclic number.

It is not a de Polignac number, because 21010000122101 - 2²² = 21009995927797 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21010000122131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505000061050 + 10505000061051.

It is an arithmetic number, because the mean of its divisors is an integer number (10505000061051).

Almost surely, 2^{21010000122101} is an apocalyptic number.

It is an amenable number.

21010000122101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010000122101 is an equidigital number, since it uses as much as digits as its factorization.

21010000122101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21010000122101 its reverse (10122100001012), we get a palindrome (31132100123113).

The spelling of 21010000122101 in words is "twenty-one trillion, ten billion, one hundred twenty-two thousand, one hundred one".