21110211121011 has 8 divisors (see below), whose sum is σ = 28146969452544. Its totient is φ = 14073463435080.

The previous prime is 21110211120991. The next prime is 21110211121019. The reversal of 21110211121011 is 11012111201112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21110211121011 - 2⁵ = 21110211120979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21110211121019) 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 7 ways as a sum of consecutive naturals, for example, 5900326 + ... + 8776916.

It is an arithmetic number, because the mean of its divisors is an integer number (3518371181568).

Almost surely, 2^{21110211121011} is an apocalyptic number.

21110211121011 is a deficient number, since it is larger than the sum of its proper divisors (7036758331533).

21110211121011 is a wasteful number, since it uses less digits than its factorization.

21110211121011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5322801.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 21110211121011 its reverse (11012111201112), we get a palindrome (32122322322123).

The spelling of 21110211121011 in words is "twenty-one trillion, one hundred ten billion, two hundred eleven million, one hundred twenty-one thousand, eleven".