21011110110111 has 32 divisors (see below), whose sum is σ = 31420560568320. Its totient is φ = 12378919039200.

The previous prime is 21011110110077. The next prime is 21011110110143. The reversal of 21011110110111 is 11101101111012.

It is not a de Polignac number, because 21011110110111 - 2⁶ = 21011110110047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011110110161) 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, 34788231 + ... + 35387048.

It is an arithmetic number, because the mean of its divisors is an integer number (981892517760).

Almost surely, 2^{21011110110111} is an apocalyptic number.

21011110110111 is a deficient number, since it is larger than the sum of its proper divisors (10409450458209).

21011110110111 is a wasteful number, since it uses less digits than its factorization.

21011110110111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70175547.

The product of its (nonzero) digits is 2, while the sum is 12.

Adding to 21011110110111 its reverse (11101101111012), we get a palindrome (32112211221123).

The spelling of 21011110110111 in words is "twenty-one trillion, eleven billion, one hundred ten million, one hundred ten thousand, one hundred eleven".