1021000020011 has 2 divisors, whose sum is σ = 1021000020012. Its totient is φ = 1021000020010.

The previous prime is 1021000019987. The next prime is 1021000020071. The reversal of 1021000020011 is 1100200001201.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021000020011 is a prime.

It is not a weakly prime, because it can be changed into another prime (1021000020071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510500010005 + 510500010006.

It is an arithmetic number, because the mean of its divisors is an integer number (510500010006).

Almost surely, 2^{1021000020011} is an apocalyptic number.

1021000020011 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021000020011 is an equidigital number, since it uses as much as digits as its factorization.

1021000020011 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 8.

Adding to 1021000020011 its reverse (1100200001201), we get a palindrome (2121200021212).

The spelling of 1021000020011 in words is "one trillion, twenty-one billion, twenty thousand, eleven".