21120110111 has 16 divisors (see below), whose sum is σ = 22825359360. Its totient is φ = 19482096480.

The previous prime is 21120110107. The next prime is 21120110147. The reversal of 21120110111 is 11101102112.

It is a cyclic number.

It is not a de Polignac number, because 21120110111 - 2² = 21120110107 is a prime.

It is a super-2 number, since 2×21120110111² (a number of 21 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 = 21120110092 and 21120110101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120110161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 557276 + ... + 593966.

It is an arithmetic number, because the mean of its divisors is an integer number (1426584960).

Almost surely, 2^21120110111 is an apocalyptic number.

21120110111 is a deficient number, since it is larger than the sum of its proper divisors (1705249249).

21120110111 is a wasteful number, since it uses less digits than its factorization.

21120110111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37606.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 21120110111 its reverse (11101102112), we get a palindrome (32221212223).

The spelling of 21120110111 in words is "twenty-one billion, one hundred twenty million, one hundred ten thousand, one hundred eleven".