11021020021 has 16 divisors (see below), whose sum is σ = 12198115008. Its totient is φ = 9873360000.

The previous prime is 11021020001. The next prime is 11021020027. The reversal of 11021020021 is 12002012011.

It is a cyclic number.

It is not a de Polignac number, because 11021020021 - 2²⁷ = 10886802293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11021020027) 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 in 15 ways as a sum of consecutive naturals, for example, 1044271 + ... + 1054771.

It is an arithmetic number, because the mean of its divisors is an integer number (762382188).

Almost surely, 2^11021020021 is an apocalyptic number.

11021020021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11021020021 is a deficient number, since it is larger than the sum of its proper divisors (1177094987).

11021020021 is a wasteful number, since it uses less digits than its factorization.

11021020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11892.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 11021020021 its reverse (12002012011), we get a palindrome (23023032032).

The spelling of 11021020021 in words is "eleven billion, twenty-one million, twenty thousand, twenty-one".