21011100022011 has 16 divisors (see below), whose sum is σ = 30561807305088. Its totient is φ = 12733913649600.

The previous prime is 21011100022009. The next prime is 21011100022037. The reversal of 21011100022011 is 11022000111012.

It is not a de Polignac number, because 21011100022011 - 2¹ = 21011100022009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21011100022111) 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 in 15 ways as a sum of consecutive naturals, for example, 2961616 + ... + 7126946.

It is an arithmetic number, because the mean of its divisors is an integer number (1910112956568).

Almost surely, 2^{21011100022011} is an apocalyptic number.

21011100022011 is a deficient number, since it is larger than the sum of its proper divisors (9550707283077).

21011100022011 is a wasteful number, since it uses less digits than its factorization.

21011100022011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4318202.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21011100022011 its reverse (11022000111012), we get a palindrome (32033100133023).

The spelling of 21011100022011 in words is "twenty-one trillion, eleven billion, one hundred million, twenty-two thousand, eleven".