21120110020111 has 4 divisors (see below), whose sum is σ = 21128052899800. Its totient is φ = 21112167140424.

The previous prime is 21120110020103. The next prime is 21120110020171. The reversal of 21120110020111 is 11102001102112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21120110020111 - 2³ = 21120110020103 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21120110020091 and 21120110020100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120110020171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3971435856 + ... + 3971441173.

It is an arithmetic number, because the mean of its divisors is an integer number (5282013224950).

Almost surely, 2^{21120110020111} is an apocalyptic number.

21120110020111 is a deficient number, since it is larger than the sum of its proper divisors (7942879689).

21120110020111 is an equidigital number, since it uses as much as digits as its factorization.

21120110020111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7942879688.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21120110020111 its reverse (11102001102112), we get a palindrome (32222111122223).

The spelling of 21120110020111 in words is "twenty-one trillion, one hundred twenty billion, one hundred ten million, twenty thousand, one hundred eleven".