21012101010011 has 2 divisors, whose sum is σ = 21012101010012. Its totient is φ = 21012101010010.

The previous prime is 21012101009993. The next prime is 21012101010083. The reversal of 21012101010011 is 11001010121012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21012101010011 - 2²² = 21012096815707 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21012101009974 and 21012101010001.

It is not a weakly prime, because it can be changed into another prime (21012101013011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506050505005 + 10506050505006.

It is an arithmetic number, because the mean of its divisors is an integer number (10506050505006).

Almost surely, 2^{21012101010011} is an apocalyptic number.

21012101010011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012101010011 is an equidigital number, since it uses as much as digits as its factorization.

21012101010011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 21012101010011 its reverse (11001010121012), we get a palindrome (32013111131023).

The spelling of 21012101010011 in words is "twenty-one trillion, twelve billion, one hundred one million, ten thousand, eleven".