21110011011 has 6 divisors (see below), whose sum is σ = 30492238140. Its totient is φ = 14073340668.

The previous prime is 21110010983. The next prime is 21110011049. The reversal of 21110011011 is 11011001112.

It is not a de Polignac number, because 21110011011 - 2⁵ = 21110010979 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 2345556779 = 21110011011 / (2 + 1 + 1 + 1 + 0 + 0 + 1 + 1 + 0 + 1 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 21110010984 and 21110011002.

It is not an unprimeable number, because it can be changed into a prime (21110011051) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1172778381 + ... + 1172778398.

It is an arithmetic number, because the mean of its divisors is an integer number (5082039690).

Almost surely, 2^21110011011 is an apocalyptic number.

21110011011 is a deficient number, since it is larger than the sum of its proper divisors (9382227129).

21110011011 is a wasteful number, since it uses less digits than its factorization.

21110011011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2345556785 (or 2345556782 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 9.

Adding to 21110011011 its reverse (11011001112), we get a palindrome (32121012123).

It can be divided in two parts, 211100 and 11011, that added together give a triangular number (222111 = T₆₆₆).

The spelling of 21110011011 in words is "twenty-one billion, one hundred ten million, eleven thousand, eleven".