11021000021 has 2 divisors, whose sum is σ = 11021000022. Its totient is φ = 11021000020.

The previous prime is 11021000017. The next prime is 11021000033. The reversal of 11021000021 is 12000012011.

11021000021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7941304996 + 3079695025 = 89114^2 + 55495^2 .

It is a cyclic number.

It is not a de Polignac number, because 11021000021 - 2² = 11021000017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11020999972 and 11021000008.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11021000051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5510500010 + 5510500011.

It is an arithmetic number, because the mean of its divisors is an integer number (5510500011).

Almost surely, 2^11021000021 is an apocalyptic number.

It is an amenable number.

11021000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

11021000021 is an equidigital number, since it uses as much as digits as its factorization.

11021000021 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 11021000021 its reverse (12000012011), we get a palindrome (23021012032).

The spelling of 11021000021 in words is "eleven billion, twenty-one million, twenty-one", and thus it is an aban number and an uban number.