21101010020011 has 32 divisors (see below), whose sum is σ = 22079562462720. Its totient is φ = 20142878515200.

The previous prime is 21101010019963. The next prime is 21101010020021. The reversal of 21101010020011 is 11002001010112.

It is a cyclic number.

It is not a de Polignac number, because 21101010020011 - 2⁹ = 21101010019499 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21101010020011.

It is not an unprimeable number, because it can be changed into a prime (21101010020021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2882254231 + ... + 2882261551.

It is an arithmetic number, because the mean of its divisors is an integer number (689986326960).

Almost surely, 2^{21101010020011} is an apocalyptic number.

21101010020011 is a deficient number, since it is larger than the sum of its proper divisors (978552442709).

21101010020011 is a wasteful number, since it uses less digits than its factorization.

21101010020011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11287.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21101010020011 its reverse (11002001010112), we get a palindrome (32103011030123).

The spelling of 21101010020011 in words is "twenty-one trillion, one hundred one billion, ten million, twenty thousand, eleven".