21010000122011 has 2 divisors, whose sum is σ = 21010000122012. Its totient is φ = 21010000122010.

The previous prime is 21010000121969. The next prime is 21010000122101. The reversal of 21010000122011 is 11022100001012.

Together with next prime (21010000122101) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21010000122011 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21010000121983 and 21010000122001.

It is not a weakly prime, because it can be changed into another prime (21010000112011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505000061005 + 10505000061006.

It is an arithmetic number, because the mean of its divisors is an integer number (10505000061006).

Almost surely, 2^{21010000122011} is an apocalyptic number.

21010000122011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010000122011 is an equidigital number, since it uses as much as digits as its factorization.

21010000122011 is an evil number, because the sum of its binary digits is even.

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

Adding to 21010000122011 its reverse (11022100001012), we get a palindrome (32032100123023).

The spelling of 21010000122011 in words is "twenty-one trillion, ten billion, one hundred twenty-two thousand, eleven".