21011110110 has 48 divisors (see below), whose sum is σ = 54645318000. Its totient is φ = 5601277440.

The previous prime is 21011110097. The next prime is 21011110111. The reversal of 21011110110 is 1101111012.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 21011110092 and 21011110101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011110111) 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 23 ways as a sum of consecutive naturals, for example, 281550 + ... + 348270.

It is an arithmetic number, because the mean of its divisors is an integer number (1138444125).

Almost surely, 2^21011110110 is an apocalyptic number.

21011110110 is an abundant number, since it is smaller than the sum of its proper divisors (33634207890).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21011110110 is a wasteful number, since it uses less digits than its factorization.

21011110110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70233 (or 70230 counting only the distinct ones).

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

Adding to 21011110110 its reverse (1101111012), we get a palindrome (22112221122).

The spelling of 21011110110 in words is "twenty-one billion, eleven million, one hundred ten thousand, one hundred ten".