21110111011 has 8 divisors (see below), whose sum is σ = 23030265024. Its totient is φ = 19190132520.

The previous prime is 21110111003. The next prime is 21110111041. The reversal of 21110111011 is 11011101112.

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

It is a cyclic number.

It is not a de Polignac number, because 21110111011 - 2³ = 21110111003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21110111041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 432720 + ... + 479026.

It is an arithmetic number, because the mean of its divisors is an integer number (2878783128).

Almost surely, 2^21110111011 is an apocalyptic number.

21110111011 is a deficient number, since it is larger than the sum of its proper divisors (1920154013).

21110111011 is a wasteful number, since it uses less digits than its factorization.

21110111011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87761.

The product of its (nonzero) digits is 2, while the sum is 10.

Adding to 21110111011 its reverse (11011101112), we get a palindrome (32121212123).

The spelling of 21110111011 in words is "twenty-one billion, one hundred ten million, one hundred eleven thousand, eleven".