21011110210111 has 8 divisors (see below), whose sum is σ = 24016671069824. Its totient is φ = 18006542772120.

The previous prime is 21011110210087. The next prime is 21011110210159. The reversal of 21011110210111 is 11101201111012.

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

It is not a de Polignac number, because 21011110210111 - 2⁹ = 21011110209599 is a prime.

It is a super-2 number, since 2×21011110210111² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21011110210091 and 21011110210100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011110214111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 248310105 + ... + 248394706.

It is an arithmetic number, because the mean of its divisors is an integer number (3002083883728).

Almost surely, 2^{21011110210111} is an apocalyptic number.

21011110210111 is a deficient number, since it is larger than the sum of its proper divisors (3005560859713).

21011110210111 is an equidigital number, since it uses as much as digits as its factorization.

21011110210111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496710861.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 21011110210111 its reverse (11101201111012), we get a palindrome (32112311321123).

Subtracting from 21011110210111 its reverse (11101201111012), we obtain a palindrome (9909909099099).

The spelling of 21011110210111 in words is "twenty-one trillion, eleven billion, one hundred ten million, two hundred ten thousand, one hundred eleven".